$Id: //main/2015/qhull/src/Changes.txt#28 $

.............This file lists all changes to qhull and rbox.....................

------------
Need help
 - Write an incremental addPoint using bucketed inputs and facet location search (see CGAL)
 - Compute hyperplanes in parallel (cf. qh_setfactplane)
 - Create Voronoi volumes and topology using a parallel implementation
 - Produce conformant triangulations for merged facets using option 'Qt' 
 - Integrate 4dview with Geomview 1.9.5
 - Qhull needs RPM and Debian builds (CMake's CPackRMP and CPackDeb).   
 - Qhull needs a mirror/archive site for old and new builds
 - Constrained delaunay triangulation via Shewchuk's algorithm (ACM Symp. Comp. Geo., 1998)
 - More enhancements -- http://www.qhull.org/html/qh-code.htm#enhance
 - The C++ interface needs work.  Give it a try and make it better. 
   http://github.com/qhull/qhull/wiki

------------
Qhull 2015.2 2016/01/18 (7.2.0) 
 - Fixed memory leak in ~QhullQh [M. Sandim]
   QhullQh.cpp: call checkAndFreeQhullMemory() in the destructor.  Otherwise memT is not freed.
   Remove checkAndFreeQhullMemory() from Qhull.h.  It is not needed.
   Remove calls to checkAndFreeQhullMemory in qhulltest.  It is called by ~QhullQh()
   libqhull_r.h: Document qh_ASvornoi and facetT.center
   qh_freeqhull: if qh_NOmem, use qh_ALL
   qh_memalloc: short memory is freed by qh_memfreeshort unless qh_NOmem
   qh_memstatistics (mem.c): call qh_memcheck() as done in mem_r.c
   qh_new_qhull calls qh_memcheck
   qh_newvertex: free vertex on error
   qh_projectinput: Free memory allocations on error
   qh_rboxpoints: free simplex on error
   qh_sethalfspace_all: Fixed memory leak on error QH8032 feasible not inside halfspace
   qh_triangulate_facet: For TRInormals ('Q11') replace qh_copypoints with qh_memalloc
   qh_triangulate_facet: Document qh.TRInormals
   qh_voronoi_center: Free center on error
   qhulltest: Fixed memory leak of s_testcases by calling RoadTest::deleteTests()
   qhulltest: The 'add_*_test' functions append the test object to RoadTest::s_testcases
   ~RoadTest: declare virtual for Q_OBJECT, removeAll not needed
   user_eg2: Check memory at end of each run
   user_r.h: Add QHULL_CRTDBG for invoking Microsoft's memory leak detector
   use _MSC_VER instead of QHULL_OS_WIN for QHULL_CRTDBG
   Call qh_freeqhull with qh_ALL/!qh_ALL instead of 'True/False'
   Include user_r.h with RoadError,h for QHULL_CRTDBG
   Invoke _CrtSetDbgFlag... at beginning of program
   Moved user_r.h/libqhull_r.h/qhull_ra.h as first include (for QHULL_CRTDBG)
   Moved QHULL_OS_WIN from qhull_ra.h to user_r.h
   Removed __CYGWIN__ from QHULL_OS_WIN (same as Qt's qglobal.h)

 - check_dupridge: A bounding box is not sufficient to avoid dupridge errors
 - qh_findbestneighor: Error if qh.CENTERtype is qh_ASvoronoi (i.e., no merging now)
 - qh_printstatlevel: Remove unused parameter, 'start'
 - QhullLinkedList::last() and back(): Return T instead of T& (T is computed)
 
 - qh-code.htm: "How to convert code to reentrant Qhull"
   Update "Nearly coincident points on an edge"
   Add 2012 size of data structures to "Qhull on 64-bit computers"
 - html/index.htm: Add CGAL to "When to use" 
 - qh-optq.htm: Add documentation for option 'Q12'
 - Move suggestions from Changes.txt to qh-code.htm#enhance
 - user_r.h: Fixed qh-us_r.html links
 - Fixed links in html pages

 - QhullIterator and QhullLinkedList: Include <iterator> [B. Boeckel]
 - Moved include file for each C++ source file to the top of the includes
 - Prepend cpp includes with "libqhullcpp/"
 - RoadLogEvent includes RoadLogEvent.h
 - QhullIterator.h: Only QHULL_DECLARE_SEQUENTIAL_ITERATOR is used.
 
 - Compared src/libqhull/* to src/libqhull_r/* and resolved differences
 - qh_printpoint in io.c skips qh_IDnone like io_r.c
 - qhull_p-exports.def: Added three missing exports
 - set_r.h: Removed countT. Too many issues
 
 - libqhull_r/Makefile: Add help prompts to 'make qtest'
 - libqhull.pro: Add '../libqhull/' to sources and headers
 - libqhull/Makefile: Fixed -I,./,,/src

 - qhull-zip.sh: Add CMakeModules to tarball [C. Rosenvik]
 - CMakeLists.txt: Add targets qhullp and user_egp for qh_QHpointer and libqhull_p
 - Reorganized 'make help'
 - Makefile cleanall: Delete testqset and qhulltest from bin/
 - Fix filetype of Unix-only files
 - Fix Unix line endings for Makefile and check in qhull-zip.sh
 - Fix Windows line-endings and check in qhull-zip.sh
 - qhull-zip.sh: Check for Unix text files

 ------------
Qhull 2015.1 2016/01/03 (7.1.0) 
 - Add Rbox option 'Cn,r,m' to add nearly coincident points.  Trigger for duplicate ridges
 - Add Qhull option 'Q12' to ignore error on wide merge due to duplicate ridge

 - qh_findbestlower: Call qh_findfacet_all to fix rare "flipped or upper Delaunay" error QH6228.
   QH6228 input provided by J. Metz.  Reported (date order): L. Fiaschi, N. Bowler, A. Liebscher, V. Vieira, N. Rhinehart, N. Vance, P. Shafer
 - qh_check_dupridge: Check if wide merge due to duplicate ridge from nearly coincident points
 - qh_initialhull: Fix error messages for initial simplex is flat
 - qh_determinant: increased 2-d and 3-d nearzero by 10x due to a counter-example
 - rbox: Add qh_outcoord() to output coordinates w/ or w/o iscdd
 - qh_meminit (mem.c): Add call to qh_memcheck
 - Compare libqhull/... to libqhull_r/... and resolve differences
 - Update builds for DevStudio (qhull.sln for msdev 2005..2009, qhull-32.sln and qhull-64.sln for recent releases)

 - qh-impre.htm: Add a section about precision errors for 'Nearly coincident points on an edge'
 - html/index.htm#geomview: Document how to install, build, and use Geomview.
 - html/index.htm: Emphasize program links and move related urls to end
 - qhull/index.htm: Emphasize manual, geomview, and imprecision
 - Fix documentation links in libqhull_r/index.htm
 - Add 'Functions' link to documentation headers
 - Change '<A>...</A>' to '<a>...</a>'
 - libqhull_r/index.htm -- Add instructions for configuring web browsers for source links.
 - libqhull_r/ -- Fix source links for ..._r.htm files

------------
Qhull 2015.0.7 2015/11/09 (7.0.7)
 - Fix return type of operator-> in QhullLinkedList and other collection classes [F. Jares]
 - Fix return types for QhullLinkedList
 - Fix return types for QhullPoints
 - Simplify return type for Coordinates::operator[] (same as QList) 
 - Add const to operators for QhullSet::iterator and add documentation
 - Coordinates.h: Fix return types for operations of iterator and const_iterator
 - Drop use of Perforce changelist number in qhull_VERSION of CMakeLists.txt
 - Rename the md5sum files as *.tgz.md5sum instead of *-tgz.md5sum
 - Fix build dependency for testqset_r [asekez]
 - rbox.c depends on Qhull due to qh_lib_check which uses qh_version2 for error messages
 - QhullFacet_test.cpp: Annotate Qhull invocations.   Allows their repetition.
 - QhullFacet_test.cpp: Adjust epsilon on distance tests
 - Do not create libqhullcpp as a shared library.  Qhull C++ classes may change layout and size. 
 - qhull-cpp.xml: Make a relative path to road-faq.xsl

------------
Qhull 2015.0.6 2015/10/20 (7.0.6.2013)
 - In the libraries, exit() is only called from qh_exit().  qh_exit may be redefined.
 - Add qh_fprintf_stderr to usermem.c.  May be overridden to avoid use of stderr [D. Sterratt]
   Add usermem to testqset builds
   Used by qh_fprintf_rbox
 - Remove most instances of stderr/stdout from libqhull, libqhull_r, and libqhullcpp [D. Sterratt]
   qh_fprintf_stderr may be redefined.  qh_meminit and qh_new_qhull use stderr as the default ferr
 - qh_initflags: Use qh.fout instead of stdout for 'TO file'.  A library caller may define a different qh.fout.
 - qh_settemppush: Call qh_fprintf() instead of fprintf() on error.
 - Rename qh_call_qhull as "Qhull-template" from user.c.  Updated its references.

 - qh-code.htm: "How to avoid</a> exit(), fprintf(), stderr, and stdout"
 - html/index.htm: Fix table of contents for qh-code
 - libqhull_r/index.htm: Rewrite introduction to Reentrant Qhull
 - qh-faq.htm: Rewrite "Can Qhull use coordinates without placing  them in a data file?"
 - qh-get.html: Link to github
 - Remove qhull_interface.cpp from the documentation

------------
Qhull 2015.0.5 2015/10/12 (7.0.5.1995)
- qh_new_qhull: default 'errfile' is 'stderr'.  outfile and errfile are optional [B. Pearlmutter]
- qh_new_qhull: returns qh_ERRinput instead of exit() if qhull_cmd is not "qhull ..." [B. Pearlmutter]
- qhalf_r.c,etc: Add clear of qh.NOerrexit
- global.c: gcc 4.4.0 mingw32 segfault cleared by adding comment
- usermem_r-cpp.cpp: Optional file to redefine qh_exit() as throw "QH10003.." [B. Pearlmutter]
  qh_exit() is called by qhull_r when qh_errexit() is not available.

- html/index.htm:  Add bibliographic reference to Golub & van Loan and annotated the source references
- qhalf.htm: A halfspace is the points on or below a hyperplane [D. Strawn]
- qh-opto.htm#n: Defined inside, outside, on, above, and below a hyperplane [D. Strawn]
- qhalf.htm#notes: Recast the linear program using negative halfspaces (as used by Qhull) [D. Strawn]
- qhull_a.h: Fix comment '#include "libqhull/qhull_a.h" [fe rew]

- build/qhull*.pc.in: Templates for pkg-config (derived from Fedorra) [P. McMunn]
  https://bitbucket.org/mgorny/pkg-config-spec/src/c1bf12afe0df6d95f2fe3f5e1ffb4c50f018825d/pkg-config-spec.txt?at=master&fileviewer=file-view-default
- Makefile: Remove user_eg3.o from LIBQHULLCPP_OBJS
- Makefile: Add .h dependencies for unix_r.o, etc.
- libqhull/Makefile: Fix build of rbox
- libqhull_r/Makefile: Fix build -I
- qhull.sln/user_eg3:  Add dependency on libcpp
- Removed bin/libqhull_r.dll (should be qhull_r.dll) 
- Removed  build/qhulltest.vcproj (see build/qhulltest/qhulltest.vcproj)
  
------------
Qhull 2015.0.4 2015/9/30 (7.0.4.1984)
 - qh-get.htm: Unix tarball includes version number (e.g., qhull-2015-src-7.1.0.1940.tgz) [Hauptman]
 - qglobal.c: Add qh_version2 with Unix version for "-V" option [Hauptman]
 - build/qhull-32.sln, *-32.vcxproj: Add Visual Studio 32-bit build for 2010+
 - build/qhull-64.sln, *-64.vcxproj: Add Visual Studio 64-bit build for 2010+ [G. Lodron]
 - make-vcproj.sh: Restore to eg/... It is required for Visual Studio builds
 - README.txt: updated builds and reentrant Qhull
 - Add documentation for QHULL_LIB_CHECK
 - qh_lib_check: Check for unknown QHULL_LIB_TYPE
 - qh-code.htm: Add memory requirements for 32- and 64-bit

------------
Qhull 2015.0.3 2015/9/22
 - qh_mem, qh_merge: Log before 'delete' instead of afterwards [Coverity, K. Schwehr]
 - qh_merge: Test for NULL horizon in qh_checkzero [Coverity, K. Schwehr]
 - qh_matchneighbor: Check for matchfacet not a neighbor of facet [Coverity, K. Schwehr]
 - qh_triangulate: Explicit check for visible==NULL [Coverity, K. Schwehr]
 - qh_findbestfacet (unused by qhull): Fix test of isoutside [Coverity, K. Schwehr]
 - qh_check_maxout: Check bestfacet!=0 for logging its id [Coverity, K. Schwehr]
 - qh_nearvertex: Check for bestvertex not found [Coverity, K. Schwehr]
 - qh_checkfacet: Check for missing neighbors of simplicial facets [Coverity, K. Schwehr]
 - qh_setdelnth: Check 'nth' before using it [Coverity, K. Schwehr]
 - Annotate code for Coverity warnings (most of these protected by qh_errexit) [K. Schwehr]

 - qh_printfacet3math: explicit format string (duplicates change to io.c) [B. Pearlmutter]
 - libqhull_r.h: fix spelling error (duplicates change to libqhull.h) [B. Pearlmutter]
 - unix_r.c: fix spelling error (duplicates change to unix.c) [B. Pearlmutter]
 - qhull_a.h: define qhullUnused() only if defined(__cplusplus) [R. Stogner]
 - qh_version: Use const char str[]= "string" instead of const char * str= "string" [U. Drepper, p. 27]
 - qh_newvertex: Use UINT_MAX instead of 0xFFFFFFFF
 - qh_newridge: Use UINT_MAX instead of 0xFFFFFFFF
 - Reviewed FIXUP notes

 - QhullRidge_test: t_foreach use 'foreach(const QhullVertex &v, vertices) 
 - Made '#include "RoadTest.h" consistent across all C++ tests

 - qh-code.htm: May also use libqhull_r (e.g., FOREACHfacet_(...))
 - qh-get.htm: Add list of download build repositories

 - Add CMakeModules/CheckLFS.cmake: Enables Large File Support [B. Pearlmutter]
 - Makefile: Use -fpic at all times instead of -fPIC, [U. Drepper p. 15]

------------
Qhull 2015.0.2 2015/9/1
 - global_r.c: Fixed spelling of /* duplicated in...qh_clear_outputflags */ [K. Schwehr]
 - Replaced Gitorious with GitHub
 - Moved 'to do' comments into Changes.txt

------------
Qhull 2015.0.1 2015/8/31

 Source code changes
 - Increased size of vertexT.id and ridgeT.id to 2^32 [H. Strandenes, C. Cantwell]
   Reworded the warning message for ridgeT.id overflow.  It does not affect Qhull output
 - Add qh_lib_check to check for a compatible Qhull library.
   Programs should call QHULL_LIB_CHECK before calling Qhull.
 - Include headers prefixed with libqhull/, libqhull_r/, or libqhullcpp/
 - Renamed debugging routines dfacet/dvertex to qh_dfacet/qh_dvertex 
 - Rewrote user_eg, user_eg2, and user_eg3 as reentrant code
 - Renamed 'qh_rand_seed' to 'qh_last_random'.  Declare it as DATA
 - qh_initqhull_start2 sets qh->NOerrexit on initialization
   User must clear NOerrexit after setjmp()
   
 Other source code changes
 - Define ptr_intT as 'long long' for __MINGW64__ [A. Voskov]
 - poly_r.c: initialize horizon_skip [K. Schwehr]
 - Removed vertexT.dim and MAX_vdim.  It is not used by reentrant Qhull.
 - Removed qhull_inuse.  Not used by C++
 - Removed old __MWERKS__/__POWERPC__ code that speed up SIOUX I/O
 - Moved #include libqhull/... before system includes (e.g., <stdio.h>
 - Comment-out _isatty declaration.  Avoids "C4273 ... inconsistent dll linkage"
 - Add random.h/random_r.h as an include file to random.c/random_r.c 
 - Rename rbox routines to qh_roundi/qh_out1/qh_out2n/qh_out3n 
 - Rename dfacet and dvertex to qh_dfacet and qh_dvertex 
 - Replace 'qhmem .zzz' with 'qhmem.zzz'
 - Removed spaces between function name and parentheses
 - Rename 'enum statistics' to 'enum qh_statistics'
 - Declare rbox as DATA in qhull-exports.def and qhull_p-exports.def
 - In comments, use 'qh.zzz' to reference qhT fields
 - In qh_fprintf, use qhmem.ferr to report errors
 - qh_fprintf may be called for errors in qh_initstatistics and qh_meminit
 - qh_pointid returns qh_IDnone, qh_IDinterior, qh_IDunknown in place of -3, -2, -1 resp.
 - getid_() returns qh_IDunknown in place of -1
 - After qh_meminit, qhmem.ferr is non-zero (stderr is the default)
 - Update qh_MEMalign in testqset.c to user.h (with realT and void*)
 - Split rboxT into a header file
 - Add rboxlib.h to libqhull_a.h
 - Rename PI to qh_PI and extend to 30 digits
 - Rename MAXdim to qh_MAXdim
 - Change spacing for type annotations '*' and '&' in C++ header files
 - Test for !rbox_output/cpp_object in qh_fprintf_rbox
 - Remove 'inline' annotation from explicit inline declarations
 - Column 25 formatting for iterators, etc.
 - Use '#//!\name' for section headers
 - QhullFacet.cpp: zinc_(Zdistio);
 - Clear qhT.ALLOWrestart in qh_errexit
 - Replace longjmp with qh_errexit_rbox in qh_rboxpoints
 - Add jmpExtra after rbox_errexit to protect against compiler errors
 - Add qh.ISqhullQh to indicate initialization by QhullQh()
 - Add library warnings to 'rbox D4', user_eg, user_eg2, user_eg3
 - Add headers to q_eg, q_egtest, and q_test
 - Check that qh.NOerrexit is cleared before call to qh_initflags

Qhull documentation
 - README.txt: Added references to qh-code.htm
 - README.txt: Added section 'Calling Qhull from C programs'
 - qh-code.htm: Moved Performance after C++ and C interface
 - qh-code.htm: Moved Cpp Questions to end of the C++ section
 - qh-code.htm: Fixed documentation for 'include' path.  It should be include/libqhull
 - qconvex.htm: Fixed documentation for 'i'.  It triangulates in 4-d and higher [ref]
 - Clarified qhalf space documentation for the interior point [J. Santos]
 - rbox.c: Version is same date as qh_version in global.c
 - gobal_r.c: Version includes a '.r' suffix to indicate 'reentrant'

Qhull builds
 - Development moved to http://github.com/qhull/qhull
   git clone git@github.com:qhull/qhull.git
 - Exchanged make targets for testing.  
   'make test' is a quick test of qhull programs.  
   'make testall' is a thorough test
 - Added 'make help' and 'make test' to libqhull and libqhull_r Makefiles
 - CMakeLists.txt: Remove libqhull, libqhull_r, and libqhullcpp from include_directories
 - CMakeLists.txt: Add qhull_SHAREDR for qhull_r
 - CMakeLists.txt: Retain qhull_SHARED and qhull_SHAREDP (qh_QHpointer)
 - CMakeLists.txt: Move qhull_SHARED and qhull_SHAREDP (qh_QHpointer) to qhull_TARGETS_OLD
   Drop qhull_STATICP (use qhull_SHAREDP or qhull_STATIC)
   Set SOVERSION and VERSION for shared libraries
 - Move qhull_p-exports.def back to libqhull
 - Switched to mingw-w64-install for gcc
 - Improved prompts for 'make'
 - qhull-all.pro: Remove user_eg3.cpp from OTHER_FILES
 - libqhull.pro: Ordered object files by frequency of execution, as done before
 - Add the folder name to C++ includes and remove libqhullcpp from INCLUDEPATH
 - Changed CONFIG+=qtestlib to QT+=testlib
 - Changed Makefile to gcc -O3 (was -O2)
 - Changed libqhull/libqhull_r Makefiles to both produce rbox, qhull, ..., user_eg, and user_eg2
 - Removed Debian 'config/...'.  It was needed for Qhull 2012.

libqhull_r (reentrant Qhull)
 - Replaced qh_qh with a parameter to each procedure [P. Klosterman]
   No more globally defined data structures in Qhull
   Simplified multithreading and C++ user interface
   All functions are reentrant (Qt: "A reentrant function can ... be called simultaneously from multiple threads, but only if each invocation uses its own data.")
   No more qh_QHpointer.
   See user_eg3 and qhulltest
   New libraries
      libqhull_r -- Shared library with reentrant sources (e.g., poly_r.h and poly_r.c which replace libqhull's poly.h and poly.c)
      libqhullstatic_r -- Static library with the same sources as libqhull_r
      libqhullcpp -- The C++ interface using libqhullstatic_r (further notes below)
   New executables
      testqset_r -- Test qset_r.c (the reentrant version of qset.c
      
 Source code changes for libqhull_r      
 - Add qh_zero() to initialize and zero memory for qh_new_qhull
 - Remove qh_save_qhull(), qh_restore_qhull(), and qh.old_qhstat from global_r.c
 - Remove qh_freeqhull2() (global_r.c)
 - Remove qh_freestatistics() (stat_r.c)
 - Remove qh_compare_vertexpoint (qhT is not available, unused code)
 - Remove conditional code for __POWERPC__ from unix_r.c and rbox_r.c
 - Move qh_last_random into qh->last_random (random_r.c)
 - Rename sources files with a '_r' suffix.  qhull_a.h becomes qhull_ra.h
 - Replace 'qh' macro with 'qh->'
 - Replace global qhT with parameter-0
 - Add qhmemT to beginning of qhT.  It may not be used standalone.
 - Add qhstatT to end of qhT
 - Remove qhull_inuse
 - Change qhmem.zzz to qh->qhmem.zzz
 - Replace qh_qhstat with qh->qhstat
 - Remove qh_freestatistics
 - Replace qh_last_random with qh->last_random
 - Replace rboxT with qh->rbox_errexit, rbox_isinteger, rbox_out_offset
 - Replace rbox.ferr/fout with qh->ferr/fout
 - No qh for qh_exit, qh_free, qh_malloc, qh_strtod, qh_strtol, qh_stddev
 - New qmake include files qhull-app-c_r.pri, qhull-app-shared_r.pri, qhull-libqhull-src_r.pri
 - Replace 'int' with 'countT' and 'COUNTmax' for large counts and identifiers
 - qhset converted to countT
 - Removed vertexT.dim -- No longer needed by cpp 
   Removed MAX_vdim
 - Guarantee that qh->run_id!=0.  Old code assumed that qh_RANDOMint was 31 bits

Changes to libqhullcpp
 - Added QhullVertexSet.h to libqhullcpp.pro and libqhullpcpp.pro
 - QhullVertexSet: error if qhsettemp_defined at copy constructor/assignment (otherwise double free)
 - Enable QhullSet.operator=.  Copy constructor and assignment only copies pointers
 - Changed QhullPoint.operator==() to sqrt(distanceEpsilon)
 - Added assignment of base class QhullPoints to PointCoordinates.operator=
 - Enable QhullPoints.operator=
 - Rename PointCoordinates.point_comment to describe_points
 - Add 'typename T' to definition of QhullSet<T>::value()

C++ interface
 - Reimplemented C++ interface on reentrant libqhull_r instead of libqhull
 - Prepend include files with libqhullcpp/
 - Replaced UsingLibQhull with QhullQh and macro QH_TRY
   Removed UsingLibQhull.currentAngleEpsilon and related routines
   Removed UsingLibQhull_test.cpp
   Replaced globalDistanceEpsilon with QhullQh.distanceEpsilon
   Replaced globalAngleEpsilon with QhullQh.angleEpsilon
   Moved UsingQhullLib.checkQhullMemoryEmpty to QhullQh.checkAndFreeQhullMemory
   Replaced FACTORepsilon=10 with QhullQh.factor_epsilon=1.0
 - To avoid -Wshadow for QhullQh*, use 'qqh' for parameters and 'qh()' for methods
 - Moved messaging from Qhull to QhullQh
 - Add check of RboxPoints* in qh_fprintf_rbox
 - Renamed Qhull.initializeQhull to Qhull.allocateQhullQh
   Added qh_freeqhull(!qh_ALL) as done by unix.c and other programs
 - Moved QhullPoints.extraCoordinatesCount into QhullPoints.cpp
 - Replaced section tags with '#//!\name ...'
 - Removed qhRunId from print() to ostream.
 - Removed print() to ostream.  Use '<< qhullPoint' or '<< qhullPoint.print("message")'

C++ interface for most classes
 - Remove qhRunId
 - Add QhullQh *qh_qh to all types
    Pointer comparisons of facetT,etc. do not test corresponding qh_qh
    Added to end of type for debugging information, unless wasteful alignment 
 - Add QhullQh * to all constructors
 - All constructors may use Qhull & instead of QhullQh *
 - For inherited QhullQh types, change to 'protected'
 - Renamed 'o' to 'other' except where used extensively in iterators
 - Except for conditional code, merged the Conversion section into GetSet
 - Removed empty().  Use isEmpty() instead
 - Add operator= instead of keeping it private
 - print_message=0 not allowed.  Use "" instead.
 - Rename isDefined() to isValid() to match Qt conventions
 
C++ interface by class
 - Coordinates
   Removed empty().  Use isEmpty() instead
   Added append(dim, coordT*)
   Reformated the iterators
   Convert to countT
 - PointCoordinates
   Added constructors for Qhull or QhullQh* (provides access to QhullPoint.operator==)
   Removed PointCoordinates(int pointDimension) since PointCoordinates should have a comment.  Also, it is ambiguous with PointCoordinates(QhullQh*)
   Renamed point_comment to describe_points
   Convert to countT
 - Qhull
   Remove qhull_run_i
   Remove qh_active
   Replace property feasiblePoint with field feasible_point and methods setFeasiblePoint/feasiblePoint
     Returns qh.feasible_point if defined
   Moved useOutputStream to QhullQh use_output_stream
   Renamed useOutputStream() to hasOutputStream()
   Replaced qhull_dimension with qh->input_dim  //! Dimension of result (qh.hull_dim or one less for Delaunay/Voronoi)
   Removed global s_qhull_output= 0; 
   Move qhull_status, qhull_message, error_stream, output_stream to QhullQh
   Renamed qhullQh() to qh()
   Added check of base address to allocateQhullQh(),  Was not needed for qhullpcpp
 - QhullFacet
   Constructor requires Qhull or QhullQh* pointer
   Convert to countT
   Dropped implicit conversion from facetT
   Dropped runId
   Add print("message") to replace print()
 - QhullFacetList
   Constructor requires Qhull or QhullQh* pointer
   Convert to countT
   Dropped runId
 - QhullFacetSet
   Removed empty().  Use isEmpty() instead
   Constructor requires Qhull or QhullQh* pointer
   Convert to countT
   Dropped runId
   Add operator=
   Implement print("message")
 - QhullHyperplane
   Add hyperplaneAngle() method
   Rewrite operator== to use hyperplaneAngle()
   Reorganize fields to keep pointers aligned
   Except for default constructor requires Qhull or QhullQh* pointer
   Enable copy assignment
   Reorganized header
 - QhullLinkedList
   Add operator=
   Removed empty().  Use isEmpty() instead
   Convert to countT
   iterator(T) made iterator(const T &) 
   const_iterator(T) made const_iterator(const T &) 
   const_iterator(iterator) made const_iterator(const iterator &) 
 - QhullPoint
   Add constructors for Qhull or QhullQh* pointer (for id() and operator==)
   Add defineAs(coordT*)
   Add getBaseT() and base_type for QhullSet<QhullPoint>
   Added checks for point_coordinates==0
   Removed static QhullPoint::id(), use QhullPoint.id() instead
   distance() throws an error if dimension doesn't agree or if a point is undefined
   Convert to countT
   If !qh_qh, operator==() requires equal coordinates
   Use cout<<p instead of cout<<p.print()
   Reorganized
 - QhullPoints
   Add constructors for Qhull and QhullQh* (for qh.hull_dim, QhullPoint::operator==)
   Remove QhullPoints(int pointDimension) since it is ambiguous with QhullPoints(QhullQh *qqh)
   Add operator=
   Removed empty().  Use isEmpty() instead
   Convert to countT
   operator==() tests if pointers are the same.  Ituses distanceEpsilon if qh_qh is defined
   Reorganized
 - QhullPoints::Iterator and ConstIterator
   Removed default constructors
   Add constructors for Qhull and QhullQh* (for qh.hull_dim, QhullPoint::operator==)
   Moved test of dimension from QHULL_ASSERT to operator==
   Added QHULL_ASSERT of qh_qh
   Convert to countT
 - QhullPointSet
   Constructor requires Qhull or QhullQh* instead of dimension()
   Add operator=
   Removed empty().  Use isEmpty() instead
   Convert to countT
   Always print print_message
   Drop print().  Replace with print("")
 - QhullQh
   Added methods hasOutputStream(), disableOutputStream(), and enableOutputStream() (was Qhull UseOutputStream)
   Add test of qh.NOerrexit to maybeThrowQhullMessage()
   Add qhull_status, qhull_message, error_stream, output_stream from Qhull
   Add factor_epsilon 
 - QhullRidge
   Constructor requires Qhull or QhullQh* pointer
   Dropped implicit conversion from ridgeT
   Converted otherFacet() to 'const &'
   Converted nextRidge3d() to 'const &'
   Message for '<< QhullRidge' replaces "   - " instead of preceding it
 - QhullSet
   Removed empty().  Use isEmpty() instead
   Constructor requires Qhull or QhullQh* pointer
   Convert to countT
   Add operator=
 - QhullVertex
   Constructor requires Qhull or QhullQh* pointer
   Convert to countT
   Dropped implicit conversion from vertexT
   Add message to '<< QhullVertex'
 - QhullVertexSet
   Removed empty().  Use isEmpty() instead
   Constructor requires Qhull or QhullQh* pointer
   Convert to countT
 - UsingQhullLib
   Removed
   Replace setGlobalDistanceEpsilon with setFactorEpsilon
   Replace globalDistanceEpsilon with distanceEpsilon
   
------------
Qhull 2012.1  2012/02/18 6.3.1.1494
 - Fix CMakeLists for libqhull with MATCHES [P. Gajdos]

------------
Qhull 2012.1  2012/02/18 6.3.1.1490

Code changes
 - Require option 'Qz' for Delaunay triangulation/Voronoi diagram 
   of cocircular/cospherical points [D. Sheehy]
 - qh_errexit: Do not call qh_printsummary or qh_printstats on qh_ERRinput
 - Change error QH6227 (all degenerate) from qh_ERRinput to qh_ERRprec
 - Change error QH6159 (ID overflow) from qh_ERRinput to qh_ERRqhull
 - eg/q_eg, q_egtest, q_test: Run if qconvex is in $PATH [M. Atzeri]
   
Build changes [M. Atzeri]
 - Install to share/doc/qhull instead of share/doc/packages/qhull
 - On Unix systems, install to share/man/man1 instead of man/man1
 - CMakeLists: Remove the installation of user_eg* and testqset
 - CMakeLists: Remove VERSION from qhull executables and libraries
 - CMakeLists: Define qhull_SOVERSION instead of qhull_MAJOR 
 - CMakeLists: Set SOVERSION for shared libraries
 - Rename libraries to qhull, qhull_d, qhull_p, and qhull_pd
   libqhull6_p.vcproj is now libqhull_p.vcproj
   mingw builds as libqhull.dll
   cygwin builds as cygqhull-6.dll
   linux builds as libqhull.so.6.3.1 with symbolic link as libqhull.so
 - Developers using qhull 2011: 
   libqhull6.so is now libqhull_p.so.  Do not use libqhull.so.
   qhull6.dll is now qhull_p.dll.  Do not use qhull.dll. 
 - Merged road/ into libqhullcpp/ and qhulltest/
   Moved RoadLogEvent.* and RoadError.* to libqhullcpp
   Moved RoadTest.* to qhulltest (requires Qt)
   Installed RoadTest.h in libqhullcpp 

Doc changes
 - index.htm: Mathworks uses qhull for n-d
 - qhull.htm: Fix qhull for qconvex
 - qdelaun.htm/qvoronoi.htm: Use option 'Qz' for circular/cospherical inputs
 - make help: Display targets
 - Makefile: Better messaging

------------
Qhull 2012.1  2012/02/02 6.3.0.1483

Bug fixes
 - Fixed qset.c for -fno-strict-aliasing. This gcc option is no longer needed
   (disallow two pointers of differing types to the same memory location)
 - Fixed error in qh_setappend_set if first set full and second set empty
 - qh_setdelnth, qh_setdelnth_sorted: fixed wording of error message
 - qh_setcheck: error message listed size and max backwards.
 - qh_setequal: Allow NULL set as documented
 - qh_setindex: Allow NULL set as documented
 - qh_settemppush: report error if NULL

Code changes
 - Add testqset: low level test of qset.c with mem.c
 - qh_setendpointer: Implements QSet::endPointer()
 - Assigned unique error code for qh_gethash

Build changes
 - Added qhull.dll(.so) for Octave and other Debian builds
   The global data structure qh_qh is statically defined (no qh_QHpointer)
   Linked user_eg2 with qhull.dll (libqhull.so) instead of qhullstatic
   Added qh_dllimport to libqhull.h for qhull.dll with MSVC 
   Changed qhull-app-shared.pri to use libqhull (without qh_QHpointer)
 - Renamed libqhull6.so to libqhull6_p.so
   Renamed qhull6.dll to qhull6_p.dll
   The _p libraries (e.g., libqhull6_p.so) require -Dqh_QHpointer
   Renamed qhull6.vcproj to libqhull6_p.vcproj
   Added libqhullp/libqhullp.pro for shared library (libqhull6_p.so)
   Added qhull-app-sharedp.pri for shared libraries with qh_QHpointer
 - Install libqhull/*.htm files into include/libqhull
 - Removed libqhull/qhull.h-deprecated [J. Eaton]
 - Other changes to Makefile builds
   Added 'make qtestall' as a smoketest of each qhull program
   src/libqhull/Makefile: Use 'ar -rs ...' instead of ranlib
   src/libqhull/Makefile: Fixed targets for cleanall
 - Other changes to DevStudio builds
   Moved pdb files for qhull libraries to lib/
   AdditionalIncludeDirectories: Removed ../src/libqhullcpp 
   Use build-cmake/ for the DevStudio CMake build
 - Other changes to Qt builds
   Renamed qhull-libsrc.pri to qhull-libqhull-src.pri
 - Added explicit d2u conversions to qhull-zip.sh
 - Fixed \n vs. \r\n issues for Windows source files

 Draft of Debian/AutoConf build (untested)
 - Adjusted the Makefile.am's for the new directory structure.
 - Added testqset to bin_PROGRAMS
 - config/bootstrap.sh copies program sources into src/libqhull
 - Kept qh_QHpointer=0 (static global data structure, qh_qh).  It is faster.
   Planning a new interface (qhull7?) which passes qh_qh as a parameter
 - Added config/changelog from the 2003.1 Debian build
 - Moved the debian/patches directory to config/
   Optional patches to change smoketest message and turn on qh_QHpointer
 - Deleted the debian directory.  It was the old Debian build from 2003.1
   Rafael Laboissiere's config directory replaced this build..
 - Deleted Make-conf.sh (also the old Debian build)
 
Doc changes
 - FAQ: Updated notes on computing volume of a Voronoi region
 - Added direct link to ACM Digital Library for downloading the qhull paper
 - Added link to Qhull in R
 - qset.c: Updated notes about NULL sets
 - qh_setappend: clarify qh_setappend for NULL newelem
 - qh_setdellast: Fix head note
 - Add build/README.txt
 - Add uninstall instructions to README.txt and CMakeLists.txt
 - Added instructions to create build/*.vcproj to CMakeLists.txt
 - Update copyright to 2012
 - Updated page links.  Added Google books, patents, and blogs. 

-----------
Qhull 2009.1.3 2011/12/06
  configure: Add  -fno-strict-aliasing if $GCC,  Required for gcc 4.1+

------------
Qhull 2011.2  2011/11/29 6.2.1.1446

Bug fixes
 - qh_new_qhull: Call qh_prepare_output if !outfile [A. Aldoma]
   No effect on qhull users since qh_prepare_output is always called.
 - Replace Qhull-go.pif with Qhull-go.lnk for Windows 7 64-bit [lots]
 - Error if qh_newhashtable, qh_setnew, or qh_memalloc overflows [X. Cheng]
   For example, 'rbox 64 D32' overflows hash table for qh_matchnewfacets
   Qhull uses 32-bit ints for identifiers, counts, and sizes. See "WARN64"
 - q_eg, q_test: change tail +3 to tail -n +3 [N. Dubray, M. Atzeri]
 - Qhull-go.bat: Changed 'cmd' to '%comspec%'

Build changes
 - Added src/libqhull/Makefile for simple gcc build of executables and lib
 - qhulltest.vcproj: Replaced full path to QT with $QTDIR (e.g., c:/qt/4.7.4)
 - Split userprintf_rbox.c from userprintf.c,  
   Otherwise qhull brings in rboxlib and rbox brings in libqhull
 - Makefile: qhullx target must be after LIBQHULLS_OBJS
 - Makefile: Explicitly list rbox dependencies for qhullx target
 - MBorland: Fixed tabs
 - Placed $LIBQHULLS_OBJS in same order.  Frequently called ones together. 
 - Update file lists for Make-config.sh [O. Lahaye]
 - CMakeLists: add README.txt,etc. to DOC_INSTALL_DIR [M. Atzeri]
 - Restored qhull.h-deprecated.  
   qhull.h conflicts with Qhull.h on Windows systems [C. Abela]
 - make-config.sh: Add warning that it is out-of-date
 - Remove extra space in '#! /bin/sh' in q_eg, etc. [P. Cheeseman]

Source changes
 - libqhull.h: Added qh_True and qh_False for True/False [A. Mutzel]
   Did not remove or replace True/False since it is used everywhere
 - Moved error message from qh_argv_to_command to caller.  Avoids dependency.
 - user_eg3.c: Use '10 D2' as default rbox (e.g., 'user_eg3 rbox qhull d')
 - user.c, user_eg2.c: Add test of qh_qh as done in user_eg.c
 - q_test: Removed duplicate test of qhull C-0.02

Documentation
 - index.html: Added ACM Authorizer link to ACM Trans. Math. Software
 - Split Delaunay and Voronoi FAQs
 - FAQ: How to compute the volume of a Voronoi region [C, Brinch]
 - Add 'FS' to qconvex prompt (total area and volume) 
 - Add clarification to 'Fv' about corner input sites [O. Can]
 - Qhull-go.bat: Removed out-of-date advice.  Added title.
 - qh-code.htm: Updated the discussion of multi-threading for C++ [I. Pirwani]
 
Qhull 2009.1.2 2011/11/21
 - Revert to LF line endings [P. Cheeseman]
 - Remove out-of-date material from qhull-go.bat
 - Replaced QHULL-GO with a lnk file

Qhull 2011.1  2011/05/23 6.2.0.1385 (exe/dll files unchanged)
 - delaunay.vcproj: Fixed qhullstatic_d.lib for debug and minrelsize builds
 - Did not redate the distribution

Qhull 2011.1  2011/05/18 6.2.0.1385 (exe/dll files unchanged)
 - Add 'm' library to shared and static targets on Unix [A. Bouchard]

Qhull 2011.1  2011/05/14 6.2.0.1383 (exe/dll files unchanged)
 - PointCoordinates.cpp: Add #include <iterator> [R. Richter, S. Pasko]
 - Remove deprecated libqhull/qhull.h
   Use libqhull/libqhull.h instead.  Avoids confusion with libqhullcpp/Qhull.h
 - Makefile: Add LIBDIR, INCDIR, and DESTDIR to install [L.H. de Mello]
     Separate MAN install from DOC install
     Create install directories
     Installs headers to include/libqhull, include/libqhullcpp, include/road
 - CMakeLists.txt: Add MAN_INSTALL_DIR for qhull.1 and rbox.1 man pages
     Add RoadTest.h to include/road for Qt users (road_HEADERS)
 - Renamed md5sum files to avoid two extensions
 - qh-get.htm: Add Readme links and 2009.1 note.
 - qh-optf.htm: Fix link
 - index.htm: Updated Google Scholar link
 - qhull-zip.sh: Improved error message.

------------
Qhull 2011.1  2011/04/17 6.2.0.1373

Changes to deliverables
 - qvoronoi: Deprecated 'Qt' and 'QJn'. Removed from documentation and prompts.
   These options produced duplicate Voronoi vertices for cospherical data.
 - Removed doskey from Qhull-go.bat.  It is incompatible with Windows 7
 - Added 'facets' argument to user_eg3.cpp
 - user_eg links with shared library
 - qhulltest.cpp: Add closing prompt.

Changes to build system
 - Reorganized source directories
 - Moved executables to bin directory
 - Add CMake build for all targets (CMakeFiles.txt) [M. Moll assisted]
 - Add gcc build for all targets (Makefile)
 - Fixed location of qhull.man and rbox.man [M. Moll]
 - Add DevStudio builds for all targets (build/*.vcproj)
 - Added shared library (lib/qhull6.dll)
   Added qh_QHpointer_dllimport to work around problems with MSVC
 - Added static libraries with and without qh_QHpointer (lib/qhullstatic.lib)
 - Added eg/make-vcproj.sh to create vcproj/sln files from cmake and qmake
 - Document location of qh_QHpointer
 - Use shadow build directory
 - Made -fno-strict-aliasing conditional on gcc version
 - Added src/qhull-app-cpp.pri, src/qhull-app-c.pri, etc. for common settings
 - Add .gitignore with ignored files and directories.  
 -   Use .git/info/exclude for locally excluded files.
 - Fixed MBorland for new directory structure
 - cleanall (Makefile): Delete 'linked' programs due to libqhull_r and libqhull/Makefile

Changes to documentation
 - qvoronoi.htm: Remove quotes from qvoronoi example
 - qhull-cpp.xml: Add naming conventions
 - index.htm: Add Google Scholar references
 - qh-optf.htm: Add note about order of 'Fn' matching 'Fv' order [Q. Pan]
 - Add patch for old builds in qh-get.htm
 - Added C++ compiling instructions to README.txt
 - Add instructions for fixing the DOS window
 - Changed DOS window to command window
 - Fixed html links
 - qh-get.htm: Dropped the Spanish mirror site.  It was disabled.

Changes to C code
 - mem.h: Define ptr_intT as 'long long' for Microsoft Windows _win64 builds.
   On Linux and Mac, 'long' is 64-bits on a 64-bit host
 - Added qh_QHpointer_dllimport to work around MSVC problem
 - qconvex.c,etc.: Define prototype for _isatty
 - Define MSG_QHULL_ERROR in user.h
 - Move MSG_FIXUP to 11000 and updated FIXUP QH11...

Changes to test code
 - Add note to q_test than R1e-3 may error (qh-code.htm, Enhancements)
 - Add test for executables to q_eg, etc.
 - Fixed Qhull-go.bat.  QHULL-GO invokes it with command.com,

Changes to C++ interface
 - QhullFacet: Added isSimplicial, isTopOrient, isTriCoplanar, isUpperDelaunay
 - Added Qhull::defineVertexFacetNeighbors() for facetNeighbors of vertices.
   Automatically called for facet merging and Voronoi diagrams
   Do not print QhullVertex::facetNeighbors is !facetNeighborsDefined()
 - Assigned FIXUP identifiers
 - QhullError: Add copy constructor, assignment operator, and destructor
 - Add throw() specifiers to RoadError and QhullError
 - Renamed RoadError::defined() to RoadError::isDefined()
 - Add #error to Qhull.h if qh_QHpointer is not defined

Changes to C++ code
 - Fixed bug reported by renangms.  Vertex output throws error QH10034
   and defineVertexNeighbors() does not exist.
 - Define QHULL_USES_QT for qt-qhull.cpp [renangms]
 - Reviewed all copy constructors and copy assignments.  Updated comments.
   Defined Qhull copy constructor and copy assignment [G. Rivet-Sabourin]
   Disabled UsingQhullLib default constructor, copy construct, and copy assign 
 - Merged changes from J. Obermayr in gitorious/jobermayrs-qhull:next
 -   Fix strncat limit in rboxlib.c and global.c
 -   Changes to CMakeLists.txt for openSUSE
 - Fixed additional uses of strncat
 - Fixed QhullFacet::PrintRidges to check hasNextRidge3d()
 - Removed gcc warnings for shadowing from code (src/qhull-warn.pri)
 - Removed semicolon after extern "C" {...}
 - Removed experimental QhullEvent/QhullLog
 - Use fabs() instead of abs() to avoid accidental conversions to int
 - Fixed type of vertex->neighbors in qh_printvoronoi [no effect on results]
 - Removed unnecessary if statement in qh_printvoronoi

------------
qhull 2010.1 2010/01/14
- Fixed quote for #include in qhull.h [U.Hergenhahn, K.Roland]
- Add qt-qhull.cpp with Qt conditional code
- Add libqhullp.proj
- Add libqhull5 to Readme, Announce, download
- Reviewed #pragma
- Reviewed FIXUP and assigned QH tags
- All projects compile with warnings enabled
- Replaced 'up' glyphs with &#187;
- Moved cpp questions to qh-code.htm#questions-cpp 
- Moved suggestions to qh-code.htm#enhance 
- Moved documentation requests to qh-code.htm#enhance
- Add md5sum file to distributions
- Switched to DevStudio builds to avoid dependent libraries, 10% slower
  Removed user_eg3.exe and qhullcpp.dll from Windows build 
  Fix qhull.sln and project files for qh_QHpointer
- Add eg/qhull-zip.sh to build qhull distribution files

------------
qhull 2010.1 2010/01/10
- Test for NULL fp in qh_eachvoronoi [D. Szczerba]

qhull 2010.1 2010/01/09

Changes to build and distribution
- Use qh_QHpointer=0 for libqhull.a, qhull, rbox, etc.
  Use -Dqh_QHpointer for libqhullp.a, qhullcpp.dll, etc.
  qh_QHpointer [2010, gcc] 4% time 4% space, [2003, msvc] 8% time 2% space
- Add config/ and project/debian/ for Autoconf build [R. Laboissiere]
  from debian branch in git and http://savannah.nongnu.org/cvs/?group=qhull
- Add CMakeLists.txt [kwilliams]
- Fix tabs in Makefile.txt [mschamschula]
- Add -fno-strict-aliasing to Makefile for gcc 4.1, 4.2, and 4.3 qset segfault
- Remove user_eg.exe and user_eg2.exe from Windows distribution
- Order object files by frequency of execution for better locality.

Changes to source
- Remove ptr_intT from qh_matchvertices.  It was int since the beginning.
- user.h requires <time.h> for CLOCKS_PER_SEC
- Move ostream<<QhullFacetList from inline to compiled.
- Removed ConvexHull/ from git.  Not used.

------------
qhull 2009.1.1 2010/01/09
- Patch release of 2009.1.
  qh_gethash allowed a negative result, causing overwrite or segfault
  See git:qhull/project/patch/qhull-2003.1/poly.c-qh_gethash.patch
  Compared results of q_test, q_eg, q_egtest with patched poly.c, qhull-2003.1

------------
qhull 2010.1 2010/01/07
- Assign type to qh.old_qhstat and memT.tempstack [amorilia]
- Replace tabs with spaces.
- Fix qh_pointid in case ptr_intT is unsigned

qhull 2010.1 2010/01/06
- Fixed serious bug in qh_gethash [poly.c]
- Documentation and build system are incomplete (see above)
- First release of C++ interface [qh-code.htm]
- Development moved to http://gitorious.org/qhull
  git clone git@gitorious.org:qhull/qhull.git
- Did not fix conformant tesselations for 'Qt'.
  For details, see http://www.qhull.org/news#bugs of May 2007 and Dec 2006.
- Use g++ builds for Windows distribution (10% faster than msvc2005)
  Combined vcproj/ and qtproj/ into project/
  vcproj will be replaced by qmake generated files

------------
qhull 2010.0.3 2010/01/05
Fixed bugs
- 'QJn': Fix qh.STOPcone in qh_build_withrestart().  It was not cleared.
- qh_initqhull_outputflags [global.c]: warn about Qc only if QHULLfinished
    otherwise set if needed

qhull 2010.0.2 2010/01/04

Fixed bugs
- qh_gethash [poly.c]: fix sign conversion.
    Previously, the result may be negative, leading to a segfault.
    The bug is more likely with large address spaces
    Reviewed all uses of %(modulo) for remainder with negative arguments
- Reviewed output of q_test and compared to results from 2003.1

Breaking code changes
- Return type of qh_gethash changed from unsigned to int.  Matches 'size'
- addhash takes a signed hash
  qh_addhash( newelem, hashtable, hashsize, hash )

Code changes
- Test for qh_qh in qh_printf
- Makefile.txt corrected for libqhull build [amorilia]
- Renamed index to idx to avoid shadowing BSD strings.h [kwilliams]

qhull 2010.0.1  2010/01/03

New Features:
 - Added option 'Ta' to annotate output with message codes

Preliminary C++ support:
 - C++ declarations may change without warning
 - Preliminary documentation for Qhull's C++ interface [qh-code.htm#cpp, qhull-cpp.xml]
 - Added user_eg3 as an example of Qhull.cpp
 - Removed qhull_interface.cpp.  Use Qhull.cpp instead.
   If math.h breaks '#include qhull_a.h', preceed it with '#include math.h'

Changes to qhull options and results
 - Allow 'd' and 'v' as the filename for 'TO ..' and 'TI ...' in qdelaunay [M. Jambon]
 - 'rbox tN' requires an integer (previously allowed floats)
 - Allow quoted filenames for 'TO ...' and 'TI ...'
 - Prefix error messages and warnings with a message code (e.g., QH6012)
 - Fixed rbox ignoring flags that were not separated by spaces
 - Report all hidden options before exiting in qh_checkflags()
 - Defined qh_OPTIONline [user.h] as max length of option line ('FO')
 - Report error if negative arguments to rbox 'G', 'L', 'Z'
 - Unknown rbox flag changed from a warning to an error
 - Set error status 4 qh_ERRmem if rbox runs out of memory
 - Removed extra spaces at end of line

Breaking Code Changes:
 - Renamed qh.coplanarset to coplanarfacetset.  Avoids conflict with facetT.coplanarset
 - qh_restore_qhull() zeroes out qh.old_qhstat and qh.old_tempstack.  Ownership moved.
 - Rewrote save_qhull/restore_qhull
 - Add Ztotcheck to zzdef_ [R. Gardener]
 - Changed qh_malloc to size_t (was unsigned long)
 - Declare qh_PRINT instead of int [kwilliams]
 - In qh_printafacet(), changed error output to 'qh ferr'

Bug fixes to C code:
 - Use gcc 4.4.0 or later.  gcc 4.2.1, 4.2.2, and 4.3.2 -O2 segfaults in qset.c .  gcc 4.1.1 was OK
   See bug report http://gcc.gnu.org/ml/gcc-bugs/2007-09/msg00474.html
 - Rewrite qh_setappend to avoid g++ 4.1, 4.2, and 4.3 strict_aliasing error.
     Orion Poplawski (orion@cora.nwra.com)
     http://www.rpmfind.net/linux/RPM/fedora/12/ppc/qhull-devel-2003.1-13.fc12.ppc64.html
 - Fixed qh_findfacet_all(), "REALmin" should be "-REALmax" [L.A. Taylor].
     Effects library users for convex hulls and halfspace intersections.
 - qh_printfacet [io.c] Removed extra space for neighboring facets
 - Report error if d points, Delaunay, and not Qz
 - Fixed double-free of facet->centrum for triangulated facets
 - Fixed mindist initialization if !testcentrum in io.c findbest_test [Ratcliff]
 - Fixed parentheses around warning for missing 'Qc' [qh_initqhull_outputflags]
 - Fixed rbox buffer overflow of 'command' when appending seedbuf
 - Fixed option string for 'rbox t t999'.  Although seed was correctly set to 999,
   a random seed was appended to the rbox comment (e.g., 'rbox t t999 t32343')
 - Fixed upper bound of sanity check for qh_RANDOMmax in qh_initqhull_globals()

Changes to C code
 - Reordered #include from specific to general.  Move up .h for module.
 - Removed qh.old_stat -- never used
 - Removed qh_clearcenters from qh_freeqhull.  Duplicated by qh_delfacet
 - qh_printcenter [io.c] removed unreachable fprintf argument
 - qh_getarea() [geom2.c] ignored on multiple calls (qh.hasAreaVolume)
 - qh_getarea() [geom2.c] checks facet->isarea. Set by QhullFacet.facetArea()
 - qh_triangulate() [poly2.c] ignored on multiple calls (qh.hasTriangulation)
 - Add statistics for vertex_visit and visit_id to buildtracing
 - Defined scale and offset parameters for qh_randomfactor

Bug fixes and changes to mem.c/mem.h
 - Fixed qhmem.totshort (total short memory in use)
 - Memory tracing (T5) redone for sort order by object
 - Added full tracing for short memory allocations.
 - Added qhmem.totfree (total short memory on freelists)
     Increases size of qh_memalloc_ and qh_memfree_
 - Added qhmem.totdropped (leftover freesize at end of each short buffer)
 - Added qhmem.totunused (short size - request size)
 - Added qhmem.totbuffer (total short memory buffer w/o links)
 - Added memory statistics to qh_NOmem;
 - Added qh_memtotal to track allocated memory
 - Renamed qh_memfree parameter to 'insize' for consistency with qh_memalloc
 - Removed qhmem.curlong.  qa_memfreeshort computes curlong from cntlong and cntfree
 - In mem.h, changed ptr_intT to long.  qh_meminit() checks that it holds a 'void*'

Fixed g++ and devstudio warnings
 - Except for bit field conversions, compiles cleanly with
   -Wall -Wextra -Wshadow -Wcast-qual -Wwrite-strings -Wno-sign-conversion -Wconversion
 - Fixed warnings at VC8, level 4
 - Fix data types to remove conversion warnings [kwilliams]
 - Use size_t for calls to malloc,etc [kwilliams]
   Retained int sizes for qset.h and mem.h.  Follows Qt convention
   and is easier to work with.  int can be 64-bits if 2 billion facets
 - Change literal strings to const char* [kwilliams]
 - Added type casts to SETfirst and SETsecond [amorilia+alphax]
 - getid_() returns an int [kwilliams]
 - Add missing const annotations [kwilliams]
 - Fixed 64-bit warnings (marked with "WARN64")
 - Convert sizeof to (int) for int parameters
 - In libqhull.c, added explicit casts from long to float,  Avoids warning
 - In global.c, cast time() to int for QRandom-seed.  Avoids warning

Changes to C code for C++ support
 - Add sln, vcproj, and qtpro files for building Qhull -- add to README notes
 - Added dim to vertexT for cpp interface. Reduced size of qh.vertex_visit
 - qh_produce_output [io.c] may be called multiple times (C++ interface)
 - Moved SETsizeaddr_() to qset.h for use by QhullSet.cpp
 - Option 'Tz' sets flag qh.USEstdout for QhullPoints.cpp
 - Added support for multiple output runs from QhullPoints.outputQhull
 -   qh_clear_outputflags() resets the output flags
 -   qh_initqhull_outputflags split from qh_initqhull_globals
 - Added qh.run_id, a random identifier for this instance of Qhull (QhullPoints)
 -   For qh.run_id, initqhull_start initializes qh_RANDOMseed to time instead of 1
 - Extracted qh_argv_to_command (random.c) from qh_init_qhull_command and fixed a buffer overflow
 - Moved qh_strtod/qh_strtol from global.c to random.c for use in rboxlib.c
 - Split out random functions into random.c
 - Added message codes to qh_fprintf().  See its definition in user.c
 - Replaced exit, malloc, free, fprintf, and fputs with qh_malloc,...[J.W. Ratcliff]
 - Added qh_fprintf, qh_malloc, qh_free, ph_printhelp_narrowhull to user.c
 - Moved qh_printhelp_degenerate and qh_printhelp_singular from io.c to user.c
 - Clear qh.ERREXITcalled at end of qh_errexit().

Documentation:
 - Fixed out-of-date CiteSeer references
 - Renamed html/qh-in.htm to html/qh-code.htm
 - Add reference to 'Qt' to 'i'
 - Add reference to 'FS' to 'FA'
 - qh-impre.htm discusses precision issues for halfspace intersection
 - Add cross references between options 'FA' and 'FS'
 - Added link to Wolfram Research's MathWorld site
 - Updated Fukuda's links
 - Changed copyright to C.B. Barber for C++, documentation, and merge.c
 - Updated Qhull citation with page numbers.
 - Proposed project: constructing Voronoi diagram
 - Proposed project: computing Voronoi volumes
 - Replaced tabs with spaces in qhull.txt and rbox.txt

------------
qhull 2009.1  2009/6/11

This is a maintenance release done by Rafael Laboissiere <rafael@debian.org>.
 - src/rbox.c (main): Avoid problems of evaluation order when
   pre-incrementing arguments of strtod
 - src/io.c (qh_produce_output), src/stat.c (qh_initstatistics): Use %lu
   instead of %d in the format string for arguments of type size_t
 - html/qhull.man, html/rbox.man: Fix several syntax, macros, and hyphen
   problems in man pages
 - The Autotools files have been generated with modern version of autoconf (2.63),
   automake/aclocal (1.10.2), and libtool (2.2.6)
 - Some character issues in the man pages are fixed

------------
qhull 2003.1  2003/12/30

New Features:
 - Add Maple output ('FM') for 2-d and 3-d convex hulls [T. Abraham]

Breaking Code Changes:
 - Annotate C code with 'const'.  An ANSI compatible compiler is required.

Bug Fixes and Code Changes:
 - Fixed qh_findbest() for upperdelaunay facets w/o better, lower neighbors
     For library users and some qhull users [A. Cutti, E. Milloti, K. Sun]
 - Preserved qhmem.ferr in qh_memfreeshort() for library users
 - Removed 'static' from qh_compare... for io.h and merge.h [V. Brumberg]
 - Split out qh_initqhull_start2() to avoid allocating qh_qh
 - Split out qh_freeqhull2() to avoid freeing qh_qh
 - Split out qh_produce_output2() and qh_prepare_output()
 - qh_initstatistics() frees a previously existing qh_qhstat
 - qh_initqhull_start2() checks that qh_initstatistics() called first

Documentation:
 - Add warning to findDelaunay() and qh_in.htm about tricoplanar facets
 - Noted Edelsbrunner's Geometry & Topology for Mesh Generation [qh-impre.htm]
 - Noted Gartner's Miniball algorithm [qh_impre.htm]
 - Noted Veron and Leon's shape preserving simplification [qh_impre.htm]

qhull 2003.1  2003/12/19

Bug Fixes:
 - Reversed coordinate order for qh.ATinfinity in qh_projectinput [V. Brumberg]
   This effects:
     Qhull library 'd' or 'v' users with 'Qz' and unequal coordinate ranges.
     qdelaunay/qvoronoi users with 'Qbk:0Bk:0', 'Qz', and unequal coordinate ranges

Changes to code:
 - Replaced qh_VERSION with qh_version in global.c [B. Pearlmutter]
    The previous techniques were either clumsy or caused compiler errors
 - Removed unused variables from qh_findbest and qh_findbestnew [B. Pearlmutter]
 - Note that qh.TESTpoints was added in 2002.1 for tsearch implementation

Changes to distribution:
 - Added Unix distribution including Debian files [R. Laboissiere]
    The previous Unix distribution is now the source distribution
 - Added rpm distribution [L. Mazet]
 - Investigated generation of Win32 dll.  Need to define a C++ interface.

Changes to documentation:
 - Moved Qhull to www.qhull.org (geom.umn.edu is not available)
 - The Geometry Center is archived at http://www.geom.uiuc.edu
 - Reviewed introduction to each program
    Triangulated output ('Qt') is more accurate than joggled input ('QJ')
    qdelaunay is 'qhull d Qbb' [C. Ulbrich]
    qvoronoi is 'qhull v Qbb'
    Added example of non-simplicial intersection to halfspace intersections
 - Added warning about using the Qhull library.
 - Added qhull timings to When to use Qhull [C. Ulbrich]
 - Reorganized the home page index and the manual index
 - Moved qh-home.htm to index.htm

Changes to examples
 - Fixed options for eg/eg.t23.voronoi.imprecise [B. Pearlmutter]


------------
qhull 2002.1  2002/8/20

Changes to distribution:
 - Set up savannah.nongnu.org/projects/qhull/ [R. Laboissiere]
 - Set up www.thesa.com as a backup
 - Added qh-get.htm, a local copy of the download page
 - Added Visual C++ interface to Qhull, qhull_interface.cpp [K. Erleben]
 - Use HTTP instead of FTP for downloading Qhull
 - Renamed qhull-1.0.sit.hqx

Bug fixes:
 - Fixed sign of coefficients for cdd halfspaces ('FD','Fd')  [T. Abraham]

Changes to code:
 - Replace qh_version with qh_VERSION in libqhull.h.
   Allows shared libraries and single point of definition
 - Added qh.TESTpoints for future implementation of tsearch

Changes to build
 - Makefile.txt works under cygwin
 - Added Make-config.sh to create a Debian build [R. Laboissiere]
 - Added .exe to Makefile.txt#clean.
 - In README, use -fno-strict-aliasing with gcc-2.95.1 [Karas, Krishnaswami]
 - Fixed chmod in Makefile.txt [B. Karas]

Documentation updates
 - Documented input options for each program [A. Montesinos]
 - FAQ: "How to get the radii of the empty spheres for Voronoi vertices"

URL updates:
 - Changed official URL from locate/qhull to software/qhull
 - Changed URLs from relative to absolute in qh-home.htm and qh-get.htm
 - Added URL for Newsgroup: comp.soft-sys.matlab
 - Added URL for GNU Octave
 - Added URLs for Google and Google Groups
 - Replaced qhull_mail.html and qhull_bug.html with mailto links.
 - Removed URL for Computational Geometry Tribune
 - Changed URL for locate/cglist to software/cglist
 - Used site relative links for qh-home.htm

------------
qhull 3.1 2001/10/04

New features
 - Added option 'Qt' to triangulate non-simplicial facets
 - Added option 'TI file' to input data from file
 - Added option 'Q10' to prevent special processing for narrow distributions
        e.g., RBOX 1000 L100000 s G1e-6 t1001803691 | QHULL Tv Q10
 - Tried to compute Voronoi volumes ('Pv'). Requires dual face graph--not easy
        See Clarkson's hull program for code.

Changes to options
 - Added numtricoplanars to 'Fs'. Number of good, triangulated facets for 'Qt'
 - Added Zdelvertextot to 'Fs'.  If non-zero and Delaunay, input is degenerate
 - Qhull command ('FQ') may be repeated.
 - If 'TPn' and 'TWn' defined, trace the addition of point 'n'
     otherwise continue tracing (previously it stopped in 4-d)
 - Removed 'Ft' from qdelaunay.  Use 'Qt o' or 'qhull d QJ Qt' instead.
     For non-simplicial regions, 'Ft' does not satisify the Delaunay property.
 - If 'Po' or 'TVn', qhull checks outer planes.  Use 'Q5' to turn off.
 - If 'T4', print facet lists and check polygon after adding each point

Corrections to code
 - rbox: allow 'c' and 'd' with 's r', meshes, etc.
 - qh_findbest: redesigned as directed search. qh_findbesthorizon for coplanar
      qh_findbest is faster for many distributions
 - qh_findbestnew: redesigned to search horizon of coplanar best newfacets
      needed for distributions with a sharp edge,
          e.g., rbox 1000 s Z1 G1e-13 | qhull Tv
 - qh_findbest/qh_findbestnew: search neighbors of better horizon facets
      was needed for RBOX 1000 s Z1 G1e-13 t996564279 | qhull Tv
      and RBOX 1000 s W1e-13 P0 t996547055 | QHULL d Qbb Qc Tv
 - qh_findbest with noupper: could return an upperdelaunay facet if dist>qh.MINoutside.
 - qh_findbestnew: allow facet->upperdelaunay if dist > qh.MINoutside
 - qh_partitioncoplanar: call qh_partitionpoint if outside and perpendicular
      for distributions with a sharp edge
 - qh_partitionvisible: report precision error if all newfacets degenerate.
      was needed for RBOX 1000 s W1e-13 t995138628 | QHULL d
 - qh_createsimplex: clears qh.num_visible, may be non-zero with 'TRn QJ'

Changes to prompts, warnings, and statistics
 - For Delaunay & Voronoi, 's' reports deleted vertices due to facet merging.
   They were incorrectly reported as nearly incident points.
 - Warn if recompute centrum after constructing hull
 - Simplified narrow hull warning and print all digits of cosine.
     A narrow hull may lead to a point outside of the hull.
 - Print total vertices deleted instead of ave. per iteration (Zdelvertextot)
 - Improved tracing for qh_partitionpoint and qh_partitioncoplanar
 - Added number of distance tests for checking outer planes (qh_check_maxout)
 - Simplified "qhull precision error: Only n facets remain."
 - Included 'TRn' in the causes of a premature exit

Changes to documentation
 - README.txt: Added quickstart instructions for Visual C++
 - rbox: Added example of edge of narrow lens, rbox 1000 L100000 s G1e-6
 - Added cross references between options 'o' and 'p'.
 - qh-eg.html: added examples comparing 'Qt', 'QJ', and neither 'Qt' nor 'QJ'
        eg.15a.surface, eg.15b.triangle, eg.17a.delaunay.2, etc.
 - Reorganized and enhanced discussion of precision problems in qh_impre.htm
 - Fixed spelling errors [K. Briggs]
 - Fixed link errors, validated HTML, and spell checked [HomeSite]
 - Removed unnecessary #TOP links
 - Added source links to the qh-quick.htm's header and footer
 - qh-geom.htm, qh-poly.htm: add links to Voronoi functions in io.c
 - src/index.htm: Added how to search libqhull.h for qhull options
 - qvoronoi.htm/qdelaun.htm: 'Fc' and 'FN' includes deleted vertices

Changes to URLs
 - Added http://www.voronoi.com and http://www.magic-software.com

Changes to code
 - qh_qhull: if 'TVn' or 'TCn' do not call qh_check_maxout and qh_nearcoplanar
 - reviewed time profile.  Qhull is slower.  Optimized qh_findbestnew()
 - qh_addpoint: Added warning note about avoiding a local minimum
 - qh_checkpolygon: report qh.facet_next error if NARROWhull & dist>MINoutside
 - qh_findbest: renamed "newfacets" parameter to "isnewfacets" since it is boolT
 - qh_findbest/qh_findbestnew: testhorizon even if !MERGING
        Otherwise qhull c D6 | qhull Q0 Tv assigns coplanar points
 - qh_resetlists: add qh_RESETvisible for qh_triangulate
 - qh_findbest: search better facets first.  Rewritten.
 - qh_findbest: increased minminsearch, always check coplanar facets.
        See: RBOX 1000 s Z1 G1e-13 t996564279 | QHULL Tv
 - qh_findbestnew: report precision error for deleted cones [rare event]
        e.g.:  RBOX 1000 s W1e-13 P0 t1001034076 | QHULL d Qbb Qc Tv
 - qh_findbesthorizon: search horizon of qh.coplanarset.  New.
 - qh_findbestsharp: replaced with qh_sharpnewfacets followed by qh_findbestnew
 - qh_partitionpoint, Delaunay sites can not be inside.  Otherwise points may
       be outside upperDelaunay facets yet not near-inside Delaunay facets
       See: RBOX s 1000 t993602376 | QHULL C-1e-3 d  Qbb FA Tv
 - qh_partitioncoplanar: call qh_findbest/qh_findbestnew with qh DELAUNAY
 - qh_printlists: format long lines
 - qh_printvertex: format long lines
 - user.h: tightened qh_WARNnarrow and qh_MAXnarrow.  Do not see problems
       until they are -1.0.
 - user.h: defined qh_DISToutside, qh_SEARCHdist, and qh_USEfindbestnew
 - qh_checkfacet: in 3-d, allow #ridges > #vertices.  Can get a vertex twice
   in a ridge list, e.g,  RBOX 1000 s W1e-13 t995849315 D2 | QHULL d Tc Tv

Changes to FAQ
 - Recommended use of triangulated output ('Qt')

Changes to distribution
 - Recompiled in Visual C++ 5.0 with optimization (as was version 2.6)
 - q_test: Added bad cases for Qhull and tests for new features

Changes to Qhull library
 - Added qh_triangulate() to poly2.c.  It triangulates the output.
 - Added option 'Q11' to copy normals and recompute centrums for tricoplanar facets
        'FP' may not print the nearest vertex for coplanar points
        Use option 'Q11' when adding points after qh_triangulate()

------------
qhull 3.0 2001/02/11

Changes to distribution
 - added qconvex, qdelaunay, qhalf, and qvoronoi
 - added qhull-interface.cpp on calling Qhull from C++ [K. Erleben]
 - renamed to qhull3.0/.
 - added eg/, html/, and src/ directories

Changes to URLs
 - MathLab6 qhull: convhulln, delaunayn, griddatan, tsearchn, vororoin [Z. You]
 - Wolfram Research wrote a Mathematica interface for qdelaunay [Hinton]
 - Geomview moved from www.geom.umn.edu to www.geomview.org [M. Phillips}
 - added URLs for tcsh and cygwin to README.txt

Changes to documentation
 - reorganized table of contents and renamed qh-man.htm to index.htm
 - wrote program documentation, dropped qh-opt.htm and qh-optv.htm
 - added quick reference, qh-quick.htm
 - reorganized qh-rbox.htm and renamed it to rbox.htm
 - split up qh-c.htm for quick navigation

Corrections to code
 - fixed type of arg for error message in qh_initqhull_globals [N. Max]
 - fixed incorrect initialization of qh MINdenom_1 for scalepoints
 - fixed drop dim for 'H Qbk:0Bk:0'.  Added qh.feasible_point to qh_projectinput
 - qh_WARNnarrow is angle between facet normals.  Negate for warning message.
 -   statistics for Wangle/etc. concerns facet normals.  Reworded [E. Voth]
 - fixed error message for 'FC v'
 - report cospherical points if Delaunay and error in qh_scalelast()

Changes to code
 - turn on Pg if (QVn or QGn) and not (Qg or PG)
 - turn on Qc if format option 'Fc', 'FP', or 'Gp' (removes warning)
 - removed last good facet unless ONLYgood ('Qg').
 - added count of non-simplicial or merged facets to 'FS'
 - added count of non-simplicial facets to 's' (OK if #vertices==dim)
 - added Znonsimplicial and Znowsimplicial to 'Ts'
 - allow Mathematica output of dual polytope for halfspace intersection
 - added qh_checkflags to globals.c for multiple front ends
 - qh_initqhull_globals sets qh.MERGING if qh.MERGEexact
 - removed hashentryT.  It is no longer used.

Changes to prompts and warnings
 - reorganized prompts
 - reorganized synopsis for rbox.c
 - print warning if 'Fc' or 'FP' with 'd QJ'.  Coincident points are unlikely.
 - ignore warning if options 'v i Pp'.  qvoronoi users may need Delaunay tri.
 - reworded warning if 'Pg' and 'QVn' is not a vertex.
 - reworded warning for 'Qx Tv', qh_check_points() in poly2.c
 - if 'Pp', turn off warning for 'Qbb' without 'd' or 'v'
 - in qh_printsummary() of Voronoi and Delaunay, distinguish QVn, QGn, Pdn, PDn

Changes to FAQ
 - added FAQ item for nearly flat Delaunay triangles [Z. You]
 - added FAQ item for area and volume [R. Konatham]
 - added FAQ item for Voronoi diagram of a square [J. Yong]
 - edited FAQ item on point location in Delaunay triangles [Z. You]
 - added FAQ item on nearly flat Delaunay triangles [Dehghani]
 - added FAQ item about halfspace intersection [V. Tyberghein]
 - added FAQ item for missing ridges [M. Schmidt]
 - added FAQ item about qh_call_qhull [R. Snyder]
 - added FAQ item about memory statistics [Masi]
 - added FAQ item on meshing non-convex objects
 - added FAQ item on MATLAB and Mathematica interface

------------
qhull 2.6 1999/04/19
 - fixed memory overwrite (no effect) in qh_initstatistics() [K. Ford]
 - added zdoc11 to qh-stat.h#ZZdef for !qh_KEEPstatistics [K. Ford]
 - enhanced qh_initqhull_globals() test of qh_RANDOMint and qh_RANDOMmax
 - added debugging option to always return qh_RANDOMmax from qh_rand()
 - fixed option 'Qr', qh_initialvertices(), to allow a broken qh_rand()
   fixed option 'Qr', qh_nextfurthest(), to allow narrow hulls
     Option 'Qr' simulates the random incremental algorithm for convex hulls
 - added note that qh.num_outside includes coplanar points for narrow hulls
 - added FAQ items for triangles/ridges of 3-d Delaunay triangulation[P. Kumar]
 - added FAQ item about on-line processing with the Qhull library [O. Skare]
 - changed name of option 'Error-roundoff' to 'Distance-roundoff'

------------
qhull 2.6 1998/12/30
 - for the unbounded rays of the Voronoi diagram, use a large box [Schmidt]
     e.g., 'rbox P4,4,4 P4,2,4 P2,4,4 P4,4,2 10 | qhull v Fv' fails for point 0
     while 'rbox P4,4,4 P4,2,4 P2,4,4 P4,4,2 10 c G5 | qhull v Fv' is OK.
 - fixed qh_new_qhull() to use outfile/errfile instead of stdout/stderr [Ford]
 - clarified COPYING.txt for use in other programs [Archer]
 - improved qh_readpoints() error message for incorrect point count.
 - added FAQ item for closest triangle to a point [Sminchisescu & Heijting]
 - added FAQ item for is a point outside of a facet [Beardsley]
 - added FAQ item for visiting facets of the Delaunay triangulation [Heijting]
 - added link to Erickson's Computational Geometry Software
 - added link to Sharman's HTML version of the comp.graphics.algorithms FAQ
 - added link to Owen's Meshing Research Corner
 - added note to 'd' about quadratic size of 'rbox 100 l | qhull d' [Kumar]
 - added 'about a point' to mentions of halfspace intersection
 - added request to qh-code.htm to compute largest empty circle [Hase]
 - the DOS window in Windows NT is better than the DOS window in Windows 95
 - removed obsolete qh_findfacet() from qh-c.htm [Sminchisescu]

------------
qhull 2.6 1998/8/12
 new and modified features
 - rbox: added option Mn,m,r to generate a rotated lattice or mesh
 - rbox: report error if more than one of 'l', 'x', 'L', 's', or 'M'

 Qhull library changes
 - added qh_new_qhull() to user.c for calling qhull() from a program [D. Zwick]
   rewrote user_eg.c to use qh_new_qhull().  Added qh_QHpointer example.
 - added qh_CLOCKtype 2 in user.h to call times() for CPU time [B. Hemkemeier]
 - renamed set.c/set.h to avoid conflict with STL's set.h [G. van den Bergen]
   can also use '#include <qhull/qhull_a.h>' for Qhull library

 fixed errors
 - fixed qh_init_B() to call qh_initqhull_mem() once only [D. Zwick]
   This only effects Qhull library users of qh_QHpointer.
 - fixed qh_mergecycle_all() to check for redundant vertices [J. Nagle]
   e.g., 'rbox M3,4 64 | qhull Qc' should report 8 vertices & 48 coplanars
 - fixed gmcoord initialization in qh_setfacetplane() for qh.RANDOMdist
 - turn off qh.RANDOMdist during qh_printfacetheader()
 - fixed error messages for unknown option flags

 documentation changes
 - added note to FAQ on the Voronoi diagram of cospherical points [H. Hase]
 - added note to 'Qu' on furthest-site Delaunay triangulation via convex hull
 - added note to 'QJ' about coplanar points on the convex hull of the input
 - added note that 'o' and 'FN' list Voronoi regions in site id order [Arvind]
 - added links to Fukuda's introduction to convex hulls, etc. [H. Hase]
 - added .c and .h source files to web distribution and qh-c.htm [J. Sands]
 - documented qh_ZEROdelaunay.  Delaunay and Voronoi diagrams do not include
   facets that are coplanar with the convex hull of the input sites.

 modified code
 - replaced computed minnorm in qh_sethyperplane_det with distance test
 - removed 'qh rand_seed' since random number generator is independent of qhull
 - dropt 'qhull-PPC.sit.bin' from the distribution (out-of-date) [M. Harris]

------------
qhull 2.5 1998/5/4

 fixed errors
 - removed zero-area Delaunay triangles and furthest-site triangles [I. Beichl]
   Zero-area triangles occur for points coplanar with the input's convex hull.
 - replaced qh.MINnorm with computed minnorm in qh_sethyperplane_det [J. Nagle]
   qh.MINnorm was incorrect for the convex hull of the "teapot" example.
   Qhull runs 0-20% slower in 3-d and 4-d.
 - allow 'Qg' with furthest-site Delaunay triangulation (may be faster)
 - removed extra space in definition of FOREACHmerge_() for Alpha cc [R. LeRoy]
 - fixed innerouter type in qh_printvdiagram2 [does not effect code, R. Adams]

 documentation changes
 - to browse qh-c.htm, set MIME type of .c and .h files to text/html
 - added example of 3-d Delaunay triangulation to q-faq.htm
 - added Delaunay and Voronoi examples to qh-optv.htm

------------
qhull 2.5 1998/2/4
 - added option 'v Fi' for separating hyperplanes of bounded Voronoi regions
 - added option 'v Fo' for separating hyperplanes of unbounded Voronoi regions
 - option 'Pp' turns off the warning, "initial hull is narrow"
 - fixed partial, 3-d Voronoi diagrams (i.e., 'v Fv QVn Tc')
 - fixed missing statistics in qh_allstat* [T. Johnson]
 - rearranged qh_printvdiagram.  Use qh_eachvoronoi to iterate Voronoi ridges.
 - added qh_check_points to qh-math.c

qhull 2.5 1998/1/28
 - added option 'Fv' to print the Voronoi diagram
 - added rbox option 'x' to generate random points in a simplex
 - added rbox option 'y' to generate a simplex and random points
 - added rbox option 'On' to offset the output
 - add unpacking instructions to README.txt
 - updated discussion of forced output, 'Po'
 - sorted the options alphabetically
 - removed __STDC__ check from libqhull.h for VisualC++
 - moved qh_markvoronoi from qh_printvoronoi and cleared facet->seen flags
 - added facet->seen2 flag for 'Fv'

qhull 2.5 1998/1/16
 - fixed initialization of qh.last_low on restart of 'd QJ'
 - renamed qh_JOGGLEmax to qh_JOGGLEmaxincrease
 - updated URL for Fukuda's cdd program

qhull 2.5 1998/1/12

New or modified features
 - added option 'Fx' to print vertices by point id [G. Harris, T. McClendon]
     in 2-d, the vertices are printed in counter-clockwise order
     for Delaunay triangl., 'Fx' lists the extreme points of the input sites
 - added option 'QJ' to randomly joggle input instead of merging facets
 - added option 'TO file' to output results to a file.  Needed for Windows95.
 - added option 'TRn' to rerun Qhull n times. Use to collect joggle statistics

Corrections
 - fixed 2-d facet orientation for 'i' and 'o' outputs
 - for Mathematica 2.2 ('m') changed %10.8g to %16.8f [A. Zhaxybayev]
 - fixed incorrect warning for 'QV0 Qg' in qh_initbuild [B. Wythoff]
 - fixed unaccessible statistic if !qh_KEEPstatistics for Wnewvertexmax
 - fixed overestimate of qh ONEmerge for point sets outside of
     first quadrant and far from the origin
 - fixed overestimate of 'Qbb' for point sets far from the origin
 - fixed potential overestimate of qh DISTround under 'Qbb'
 - fixed 'p' printing coplanar points of unselected facets
 - fixed 'Ft' printing centrums unnecessarily in 2-d

Changes to documentation
 - wrote internal design documentation (qh-c.htm)
 - started frequently asked questions (qh-faq.htm)
 - added a section on joggled input to qh-impre.htm
 -   added joggle example to qh-eg.htm (eg.15.joggle)
 -   changed q_eg to use 'QJ' instead of 'Q0' were appropriate
 - added an example to each of the main options
 - added examples to rbox.htm
 - added examples to the synopsis
 - added a reference to Mucke, et al ['96], Fast randomized point location ...
 - added code for printing Delaunay triangles to qh-code.htm [A. Tsui]
 - options 'Pdk' and 'PDk' do not drop on equality

Improvements to the code
 - reviewed warning messages for Qhull options in qh_initflags
 - added warning to 's' if premature exit from 'TCn' or 'TVn'
 - 's' prints max distance above/below only if qh.MERGING
 - reduced maxoutside in qh_check_bestdist/qh_check_points for 'Rn'
 - in post-merging, rebuild centrums of large facets that become small
 - lowered cutoff for coplanar facets for ischeckmax/qh_findbest
 - removed qh_check_maxout for 'Wn Q0'
 - reset tracing after 'TPn' adds point in 4-d and higher

Changes for the Qhull library
 - changed qh_setdelaunay to call qh_scalelast if used with 'Qbb' or 'QJ'
     Delaunay callers to qh_findbestfacet, qh_addpoint, or qh_findfacet_all
     should always use qh_setdelaunay as in user_eg.c
 - defined qh.outside_err to check points against a given epsilon [E. Voth]
 - added header to user_eg.c to avoid its incorporation into qhull [C. Begnis]
 - added qh_nearcoplanar() calls to user_eg.c
     only needed if use 'QJ'
 - expanded __STDC__ warning message in libqhull.h [C. Begnis]
 - renamed qh maxmaxcoord to qh MAXabs_coord
 - replaced qh MAXlowcoord with qh MAXabs_coord
 - random seed ('QR-n') is reset in qh_initqhull_globals after testing
 - replaced 'FO' options "_max-coord/_min-coord" with "_max-width"/qh.MAXwidth

Other changes to Qhull functions
 - report error for !bestfacet in qh_findbest (it shouldn't happen) [H. Meuret]
 - set newbest in qh_findbest only if bestfacet updated
 - renamed facet parameter for qh_findbest
 - added maxdist argument to qh_checkpoint
 - moved 'FO' output after qh_partitionall
 - separated qh_initbuild from qh_qhull
 -   reinitialize globals modified by qh_buildhull
 -   moved initialization of qh.GOODvertexp & qh.GOODpointp to qh_initbuild
 - separated qh_nearcoplanar from qh_check_maxout
 - separated qh_geomplanes from qh_printfacet2geom, etc.
 - separated qh_freebuild from qh_freeqhull
 - separated qh_outerinner from io.c to return outer and inner planes
 - separated qh_distround and qh_detroundoff from qh_maxmin


------------
qhull 2.4 97/4/2

New or modified features
 - made 'C-0' and 'Qx' default options.  Use 'Q0' to not handle roundoff errors
 - removed point-at-infinity from Delaunay/Voronoi.
     you no longer need to use 'Qu PDk'
 - added 'Qz' to add a point-at-infinity to Delaunay and Voronoi constructions
 - added published version of qhull article in ACM Trans Math Software
 - ported qhull to Windows95 under Visual C++ and Borland C++
 - added 'Ft' for triangulation by adding the centrums of non-simplicial facets
 - added 'Gt' to display 3-d Delaunay triangulations with a transparent hull
 - changed definition of coplanar point in output to qh min_vertex (see 'Qc')
     it was qh MAXcoplanar ('Un') [could make vertices non-coplanar]
 - automatically set 'Qi' for options 'd Qc' and 'v Qc'.
 - reworded summary ('s') for Delaunay/Voronoi/halfspace.
     use 'Fs' and 'FS' for summary statistics.
 - for summary 's' of Delaunay/Voronoi, display number of coplanars for facets
     if none, display total number of coplanars (i.e., non-vertices)
 - input comment is first non-numeric text (previously limited to header)
 - added input warning if use 'Qbb' without 'd' or 'v'
 - 'Q3' can not be followed with a numeric option

Corrections
 - fixed qh_partitioncoplanar() to not drop interior points if 'Qi' is used
 - fixed 'FP d' to report distance in point set instead of paraboloid
 - fixed qh_findbest() to search all coplanar facets for qh_check_maxout()

Changes to documentation
 - added example eg.17f.delaunay.3 to show a triangulation of cospherical sites
 - split up qh-opt.htm into multiple pieces
 - split off qh-code.htm for Qhull code
 - renamed .html files to .htm for Windows95
 - rewrote qh-optv.htm on Delaunay triangulation and Voronoi vertices
 - added 'man' pages qhull.txt and rbox.txt.  These list all the options
 - removed 'txt' versions of html files
 - added note to 'PDk' about avoiding a 'd' option immediately after a float
 - under option 'd', display the triangulation with 'GrD3', not 'GnrD3'

Changes to the Qhull library
 - added 'format' argument to qh_printfacetNvertex_nonsimplicial() in io.c
 - removed C++ type errors [J. Stern, S. Marino]
 -  created SETelemt, SETfirstt, etc. for specifying data types.
 -  use SETelem,etc. for assignments.
 -  changed setT.maxsize to 'int' to prevent type conversion warnings
 -  changed FOREACH.. to a comma expression for better code and less warning
 -  changed qh.vertex_visit and .visit_id to unsigned int to prevent warnings
 - changed clock() to qh_CPUclock (user.h)
 - qh_init_B() and qh_readpoints() do not set qh.ATinfinity for Delaunay tri.
 - qh_setvoronoi_all() sets upper Delaunay facets if qh.UPPERdelaunay is set
 - qh_nearvertex() returns distance in dim-1 for qh.DELAUNAY
 - removed MSDOS path from qhull_command.  Spaces in Win95 tripped qh_setflags
 - removed memory.h from qhull_a.h.  memset,etc. should be in strings.h
 - split qh_prompt into pieces for Visual C++
 - added note to qh_addpoint that coordinates can not be deallocated
 - added Baker '89 to constrained Delaunay diagrams under Enhancements
    please let me know if you try this
 - added request for unbounded Voronoi rays to Enhancements
    please let me know if you try this

------------
qhull V2.3 96/6/5
 - fixed total area of Delaunay triangulation. [A. Enge]
      It should ignore facets on the upper-envelope.
 - if 'd Qu FA', the total area is summed over the upper-Delaunay triangles
 - fixed sign of area for Delaunay triangulations.
 - fixed cdd input format for Delaunay triangulation. [A. Enge]
 - for cdd input, allow feasible point for halfspaces.
 - warning if cdd output format for centrums, halfspace intersections, or OFF.
 - print '0' for area ('Fa') if area is not computed for a facet
 - option 'QR-n' sets random number seed to n without rotating input
 - fixed qh_findbest() to retest coplanar and flipped facets after a restart
 - for 'd Qu Ts' collects angle statistics for upper Delaunay facets

 Changes to the Qhull library
 - expanded user_eg.c for incremental constructions and Delaunay triangulation
 - added discussion of incremental construction to qh_man.html#library
 - WARNING: The default value of qh ATinfinity was changed from True to False.
            A new flag, qh UPPERdelaunay, was defined for 'Qu'.
         Please set qh ATinfinity if you explicitly add the point "at-infinity"
         Please set qh ATinfinity if you explicitly call qh_projectinput.
         Please set qh UPPERdelaunay if you explicitly cleared qh ATinfinity.
         Other users do not need to change their code.
   Now you can build a Delaunay triangulation without creating a point
   "at-infinity".  This removes a potential, hard-to-understand error.
   qh_readpoints sets qh ATinfinity for options 'd' or 'v' without 'Qu'.
   qh_initB sets qh ATinfinity for qh PROJECTdelaunay w/o qh UPPERdelaunay.
   qh_projectinput adds a point "at-infinity" only if qh ATinfinity is set.
 - added qh_setdelaunay to geom2.c to project points to paraboloid
 - added qh_findbestfacet() to poly2.c to replace qh_findfacet()
 - removed procedure qh_findfacet().  It does not always work.
 - removed NULL option for facet in qh_addpoint().  It does not always work.
 - added noupper parameter to qh_findbest.
 - added search of upperdelaunay facets to qh_findbest()
 - allowed qh_findbest() to start with a flipped or upperdelaunay facet
 - removed qh_nonupper() -- it is no longer needed
 - allow space at end of options
 - fixed qh_projectinput for furthest-site Delaunay (qh PROJECTdelaunay 'd Qu')
 - added voids to procedure declarations with empty parameter lists

------------
qhull V2.3 96/3/25
 - fixed missing qh_check_maxout when coplanar points and no merged facets.
 - fixed qh_freeqhull/allmem (e.g., if qh_NOmem) [only custom code] [E. Voth]
 - fixed qh_freeqhull to free qh interior_point [E. Voth]
 - fixed main() to free all of memory if qh_NOmem.  Include "mem.h" [E. Voth]
 - reset f.newcycle link in qh_mergecycle_all [E. Voth]
 - fixed false error if 'Tc', coplanar points, and a narrow hull
 - turn off 'Rn' when computing statistics, checking code, or tracing code
 - removed ={0} from global.c and stat.c to reduce compiler warnings
 - changed Makefile dependences to $(HFILES) for all but unix.o, set.o, mem.o
 - pulled out qh_printpointid and reordered qh_pointid [E. Voth]
 - removed some compiler warnings
 - moved 'FO' print of options to just before qh_buildhull
 - changed 'FO' to list difference from -1 for _narrow-hull

------------
qhull V2.2 96/2/15
 - detect narrow initial hulls (cosine of min angle < qh_MAXnarrow in user.h).
   Write warning if cosine < qh_WARNnarrow in user.h.  If narrow (qh NARROWhull),
   partition coplanar points as outside points and delay coplanar test to end.
   Needed for  RBOX 1000 L100000 s G1e-6 t995127886 | QHULL Tv
   See 'limitations' in qh-impre.html for further discussion.
 - corrected some confusions between 'FV' and 'Fv' in qh-opt.html
 - fixed initialization error for small Voronoi diagrams (e.g., [0,0], [1,0], [0,1]) [J. Velez]
  - fixed bad return from qh_mindiff in geom2.c
 - for initial hull, first process facet with furthest outside point (qh_furthestnext)
 - added facet->notfurthest flag for recomputing furthest point
 - added check for __STDC__ (needs ANSI C) [E. Voth]
 - reduced warning messages from [E. Voth].  e[1] in setT still reports a warning.
 - added a cube to the discussion of option 'v' (Voronoi) in qh-opt.html [J. Velez]
 - added notes about adjacent vertices to "Calling Qhull" in qh-man.html [R. Lewis & J. Velez]
 - added note about 'lines closer' when viewing 3-d Delaunay triangulations [P. Kallberg]
 - added option 'Q9' to always process furthest of furthest outside points.
 - removed option 'Pp' from q_eg and qh-eg.html.

------------
qhull V2.2 95/12/28
 - added option 'Qbb' to scale the last coordinate to [0,m] (max prev coord).
   This reduces roundoff errors for Delaunay triangulations with integer coordinates.
 - changed option 'Qu d' to print out the furthest-site Delaunay triangulation
   Use options 'Qu d PD2' to compute the normal 2-d Delaunay triangulation without
   the point at infinity.
 - added notes to the documentation of option 'd'
 - added notes to limitations of how Qhull handles imprecision
 - added warning if options 'FP', 'Fc', or 'Gp' without option 'Qc' or 'Qi'
 - added note to options 'PDk:n' and 'Pdk:n' that closest facet is returned if none match
 - added check that 'Qbk' and 'QBk' does not invert paraboloid for 'd'
 - added notes that qh_findfacet and qh_addpoint require lifted points for Delaunay triangulations
 - fixed 'rbox s 5000 W1e-13 D2 | qhull d Qcu C-0 Qbb'
 - fixed option 'QbB' (qh SCALEpoints was not set)
 - fixed minor confusion between 'Gc' (print centrums) and 'Gp' (print points)
 - rewrote qh_findbestnew for upper convex hull, Delaunay facets
 - changed option name for 'Gp' from 'Gcoplanar' to 'Gpoints'
 - changed "nearest" facet for 'Pdk' to threshold - normal
 - reworked qh GOODclosest for 'Qg'
 - added note that 'Qg' does not always work
 - recorded option 'C-0' as "_zero-merge" in option 'FO'
 - refined qh DISTround in qh_maxmin/geom2.c for Delaunay triangulations

qhull V2.2 95/12/4
 - Version 2.2 fixes an important bug in computing Delaunay triangulations
   and convex hulls with edges sharper than ninety degrees.  The problem
   occurs when processing a point at a sharp edge.  A directed search can
   not be used for partitioning because one side may hide facets from the
   other side.  The new lens-shaped distribution for rbox demonstrates the
   problem.  For example, 'rbox 100 L3 G0.5 s | qhull Tv' fails for Version 2.1.
   O. Schramm found the bug when computing the Delaunay triangulation of points
   near an outside edge.

   I rewrote qh_findbest and related functions.  Qh_findbest
   uses an exhaustive test for sharp edges (qh_findbest_sharp).
   Qh_findbest avoids the upper convex hull of Delaunay triangulations.

   Options 'd' and 'v' no longer assign coplanar points to the upper convex hull.

   Qh_check_maxout tests near-inside points.  It ignores fully inside points.
   When done, it removes near-inside points from the coplanar sets.

   If you use qh_addpoint or qh_findbest, please review the function headers.
   They do not work for lens-shaped hulls for arbitrary facets.  They do work for
   Delaunay triangulations.

 Changes to options for V2.2
 - added 'Qu' for computing the furthest-site Delaunay triangulation (upper hull)
   and furthest-site Voronoi vertices.
 - added 'FP' to print nearest vertex for coplanar points
 - added coplanar count to 'Fs' and 's'
 - added number of similar points to summary for Delaunay/Voronoi
 - Option 'Qc' is no longer necessary when merging.
 - 'o' format for Voronoi vertices ('v') generates "0" lines for similar points
 - 'QRn' for Delaunay ('d' or 'v') now rotates about the Z axis (see qh_init_B).
   Otherwise Qhull does not identify the upper hull
 - removed option 'Qa' for "all points outside".  In V2.1 it was automatically
   set for 'd'.  Even though it was a bad idea, it revealed the above bug.
 - for option list ('FO'), added version, values for one-merge, maxpos, maxneg,
   and near-inside, and flags for zero-centrum
 - optimized 'C-0' and 'Qx'.  These options ("zero-centrum") test vertices
   instead of centrums for adjacent simplicial facets.
 - if 'Tv', report number of points that are not verified due to qh_findbest
 - Option 'Q8' ignores near-inside points.

 rbox 95/12/3
 - added lens distribution ('Ln')  It may be used with 's', 'r', 'Wn', and 'Gn'
 - removed default point count except for the test case, 'Dn'
 - divided main() of rbox.c into sections

 Documentation changes for V2.2
 - added examples for lens distribution and furthest-site Delaunay triangulation
   and renumbered the examples for q_eg
 - described facet orientation in 'data structure' section [P. Soikkonen]
 - added notes to qh-man.html/"What to do if something goes wrong"
 - added note about using 'Tv' to verify the results [O. Schramm]
 - expanded definition of f_r in Performance section [S. Grundmann]
 - noted that Geomview display of a Voronoi diagram adds extra edges
   for unbounded Voronoi cells
 - rewrote error "convexity constraints may be too strong" [D. Newland]
 - added limitations section to "Imprecision in Qhull"
 - added note about zero-area facets to 'Imprecise convex hulls' in qh-impre.html
 - added note to 'Qi' that it does not retain coplanar points
 - added note that option 'Q5' may be used if outer planes are not needed
 - added note to README.txt about Irix 5.1 [C. Goudeseune]
 - added code fragment for visiting Voronoi vertices to "Calling Qhull" [M. Downes]
 - added note about qh_addpoint() to "Calling Qhull" [M. Downes]

 Errors fixed for V2.2
 - use qh_sethyperplane_gauss if 3-d or 4-d norm is less than qh MINnorm
 - count Zcentrumtests if qh_NOstat
 - reversed sign convention for qh_sethyperplane_gauss
   it was opposite to qh_sethyperplane_det
   this effects qh_determinant and qh_detsimplex
 - fixed error in qh_findgood_all with multiple restrictions, e.g., 'QVn Pdk'
 - fixed call to qh_clearcenters for qh_produce_output
 - in qh_errexit, report p0 if last furthest point

 Changes for users of the Qhull library
 - user code needs to define qh_version (see user_eg.c)
 - merged initialization code into qh_init_A and qh_init_B [M. Mazzario]
   old code works as before.
   qh_initflags also sets qh qhull_command for qh_initthresholds
   redid initialization for user_eg.c
 - simplified user_eg.c.  It computes the convex hull of a cube.
 - added qh_setvoronoi_all in poly2.c to compute Voronoi centers
   added related note to call_qhull
 - added qh_findfacet to use in place of qh_findbest
 - added qh_nearvertex to return nearest vertex in facet to point
 - redid notes on multiple, concurrent calls in call_qhull/user.c
 - changed BoolT to unsigned int (prevent implicit enum conversion warnings)
 - added upperdelaunay to facetT.  It indicates a facet of the upper convex hull.
 - converted qhull-PPC.sit for CodeWarrior 7

 Code changes for V2.2
 - simplified calls to setjmp() for Cray J916 [Salazar & Velez]
 - replaced fprintf(fp,string) with fputs in io.c
 - 'qh num_coplanar' removed (too expensive and not used).
 - added numcoplanars to qh_countfacets()
 - added min norm to qh_normalize2().  qh_normalize() wasn't changed
 - removed type casts from qh_point and qh_pointid [Salazar & Velez]
 - account for roundoff error in detecting upper convex hull (qh ANGLEround).
 - post merging uses qh_findbestnew for partitioning
 - qh_findbestnew for qh_partitioncoplanar goes to best facet
 - 'Qm' always processes points above the upper hull of a Delaunay triangulation
 - GOODvertex initialized with qh_findbestnew instead of qh_findbest
 - for 'v', qh_facetcenter returns furthest-neighbor vertex if 'Qu'
 - added test for qh feasible_point if use 'Fp' and qh_sethalfspace_all
 - reviewed Sugihara's algorithm for topologically robust beneath-beyond
 - on error, report if qhull in post-merging or has completed
 - if tracing, option 'FO' and qhull command always printed
 - added current furthest point ("during p%d") to 'T-1' events
 - added 'TWn' tracing for vertices of new facets (qh_setfacetplane)
 - added 'TWn' tracing for vertices in an output facet (qh_check_maxout)
 - reorganized split between poly/poly2.c and geom/geom2.c
 - reordered object files in Makefile

------------
qhull V2.1 95/9/25
 - converted qhull.man to html format, many edits
 - referenced Shewchuk's triangle program and Schneiders' Mesh Generation page
 - added option 'Qa' to force all points outside
     automatically set for "precise" Delaunay or Voronoi [Salazar & Velez]
     it is turned off by merging, 'Wn', 'Qc' or 'Qi'
 - added coplanar points to option 'FN'
 - moved option 'FO' to include default precision options
 - changed default random number generator to qh_rand in geom2.c (user.h)

 other code changes
 - fixed option comment Pdrop-facets-dim-less, Qbound-dim-low, QbBound-unit-box
 - defined ptr_intT for converting 64-bit ptrs to 'unsigned long' [D. Bremner]
 - defined setelemT to distinguish actual size from pointers [D. Bremner]
     use either e[...].p or e[...].i (user-level code should use set.h macros)
 - changed %x to %p in format statements for pointers [D. Bremner]
 - added test of REALmax,etc. to qh_maxmin [H. Poulard]
 - added type parameter to qh_memalloc_() macro for type conversion
 - added type conversion to qh_memalloc() calls where missing
 - added type conversion to calls into set.c that return void*

 other documentation changes:
 - new URLs for graphics images
 - fixed comment for facetT.neighbors in libqhull.h [P. Soikkonen]
 - changed recommendations for precision errors in qh_printhelp_degenerate()
 -  added recommendation for 'V0' (facet is visible if distance >= 0)
 - added note about 'long double' to user.h [S. Grundmann]
 - added note about zero area Delaunay triangles for the 'v' option
 - added note about locating Delaunay triangles to option 'd' [A. Curtis]
 - added note that coplanar vertices correspond to duplicate points for 'd'
 - added note about option 'd' automatically setting 'PDk' (lower convex hull)
 - added note about precision errors to option 'd' [many users]
 - added note about qh_findbest() to the Qhull library section [L. Lai]
 - 'make install' renames qhull.man to qhull.1 for Unix [M. Phillips]
 - renamed README, etc. to *.txt to match WWW conventions [D. Cervone]

------------
qhull V2.1 7/10/95
  - in 2-d, 'v o' lists the vertex at infinity in order [R. Critchlow]
  -   it used to always list the vertex at infinity ("0") first
  - rewrote description of 'v' option (Voronoi vertices and 2-d diagrams)
  - added 'PFn' for printing facets whose area is at least 'n' [D. Holland]
  - prefixed 'Q',etc. to the 'Q',etc. options in the long help prompt
  - fixed references to 'Fv' and 'FV' options under option 'Hn,n,n'
  - updated reference to cdd, <ftp://ifor13.ethz.ch/pub/fukuda/cdd/>
  - in set.c, added some missing type coercions for qhmem.tempstack

qhull V2.1 6/12/95
  - replaced qhull.ps with qhull-2.ps (paper submitted to ACM TOMS)
  - use BUFSIZ for setvbuf for Power Macintosh
  - number of good facets printed if QVn, QGn, Pd, or PD
  - added Makefile for Borland C++ 4.02 with Win32 [D. Zwick]
  - added note to Enhancements section of qhull.1 about constrained
       Delaunay triangulations [T. Rasanen]

qhull V2.1 6/7/95
  - fixed qh_facetarea_simplex() for non-simplicial facets [L. Schramm]
  - fixed cast in qh_point and qh_pointid for 64-bit architectures
  - fixed URL for Amenta's list of computational geometry software
  - fixed cast in qh_meminitbuffers for qhmem.freelists
  - added test for !qh half_space in qh readpoints
  - clarified options for qh_printhelp_singular()
  - discussed non-simplicial facet area under option 'Fa' in qhull.1

qhull V2.1 6/3/95
  - home page for Qhull and new descriptions for the Qhull examples
      http://www.qhull.org
  - changed SIOUX buffering for Power Macintosh.   It runs fast now.
      added a project file for Metrowerk's C
  - note in README about compiling qhull on the PC

qhull V2.1 beta 5/15/95

                ======= main changes ========
  - added halfspace intersection ('Hn,n,n')
  - facet merging is better, especially for high dimensions
  -   added 'Qx' for exact merges of coplanar points and precision faults
  - facet merging is faster, especially for high dimensions.
      e.g., convex hull of the 8-d hypercube is seven times faster
  - added 'F' output formats for printing each aspect of the convex hull
  - format 'Fa' computes facet areas, total area, and total volume
  - format 'FO' writes a descriptive list of selected options to stderr
  - moved all customization options to user.h
  - changed the default precision to 'double' since it's needed for Delaunay.
      using 'float' is faster and takes less space (REALfloat in user.h)
  - option 'Qm' is no longer important for facet merging
  - removed need for 'Qs' by selecting initial simplex with pos. determinants
  - renamed 'Qv' to 'Q7' since virtual memory does not work well for qhull
  - Qhull is available for the Power Mac (no graphical output)

                 ====== other new and modified options ===========
  - changed default MINvisible ('Vn') to a multiple of premerge_centrum ('C-n')
  - added 'Un' option to set width of facet for coplanar points.
       This replaces the previous rules for determining coplanar points.
  - changed default MINoutside ('Wn') to twice MINvisible ('Vn')
  - Geomview output adjusts point radii for MINvisible 'Vn'
  - the input format allows the number of points to precede the dimension
  - options 'v' 'd' 'FAn' and 'FMn' record good facets ('Pg')
  - added 'Fd' and 'FD' options for homogeneous coordinates in cdd format
  -   in rbox, added 'h' flag to generate homogeneous coordinates in cdd format
  - option 'PAn' prints out the n facets with the largest area
  - option 'PMn' prints out the n facets with the most merges
  - option 'Po' under tracing ('Tn') no longer tries to write erroneous facets
  - option 'TCn' only prints the old 'visible' facets for 'f'
  - 'TFn' reports intermediate results when post-merging
  -   option 'Ts' with option 'TFn' prints intermediate statistics
  - the message for 'Tv' reports if it is checking outer planes
  - 'Tz' sends stderr output to stdout
  - added 'Q1' to ignore angle when sorting merges (merges are worse)
  - added 'Q2' to not perform merges in independent sets (merges are worse)
  - added 'Q3' to not remove redundant vertices (faster)
  - added 'Q4' to avoid merges of old facets into new facets (does worse)
  - added 'Q5' to skip qh_check_maxout (faster, but less accurate)
  - added 'Q6' to skip pre-merge of concave and coplanar facets
  - added 'Qv' for testing vertex neighbors for convexity (needs merge option)
  - added warning if mix Geomview output with other outputs ('Po' turns off)
  - options 'o v' for 3-d and higher sort the Voronoi vertices by index

                ======= documentation =======
  - rewrote the introduction and precision sections
  - added a section on performance
  - added an example on halfspace intersection
  - installed examples of Qhull in
    <http://www.geom.uiuc.edu/graphics/pix/Special_Topics/Computational_Geometry/>

                ======= Makefile, user.h, and messages =======
  - Makefile calls ./qhull, ./rbox, and prints short prompt for qhull
  - added new statistics, e.g., for buildhull
  - changed default qh_RANDOMtype to RAND_MAX with rand()
  - added comment about numeric overflow to printhelp_singular
  - reorganized the code to improve locality of reference
  - option in mem.h (qh_NOmem) to turn off memory management in qhull
  - option in user.h (qh_NOtrace) to turn off tracing in qhull
  - option in user.h (qh_NOmerge) to turn off merging in qhull.
  -   use this instead of redefining qh_merge_nonconvex in user.c
  - simplified user_eg.c.  See qh_call_qhull() in user.c for the full version

                ======== bug fixes ============
  - fixed error in number of points for 'rbox 100 r' (odd distribution)
  - fixed performance error in qh_degen_redundant_neighbors
  - qh_partitionpoint now sets facet->maxoutside for first outside point
  - fixed performance error in partitioning when merging a large, regular cone
  - removed memory leak in qh_appendmergeset
  - removed double free of qh line under errors in qh_readinput()
  - forcing output on error ('Po') fixed for options 'n' 'o' 'i' 's'
  - fixed optimization error on HP machines [fprintf(... *p++)]

                ======== changes to libqhull.h for user code =======
  - qh_collectstatistics and qh_printstatistics removed from libqhull.h.
      should use qh_printallstatistics instead
  - qh_findbest uses boolT for newfacets
  - added qh_findbestnew for non-simplicial facets.  qh_findbest is
    too slow in this case since it needs to look at many nearly coplanar
    facets.
  - renamed qh_voronoi/qh_centrum to qh_ASvoronoi, qh_AScentrum
  - changed facet->id to 32-bits, added new flags for merging
  - added facet->f for facet pointers while merging and for facet area
  - added dfacet/dvertex for printing facets/vertices while debugging
  - added qh_produce_output and qh_printsummary

                ======== changes to code ==========
  - moved qh_setfacetplane from qh_makenewfacets to qh_makenewplanes
  - added qh_setfree2, qh_setcompact, and qh_setduplicate to set.c
  - qh_findgooddist returns list of visible facets instead of setting global
  - in qh_check_maxout, inside points may be added to coplanar list.
  - qh_findbestnew used for qh_partitionall.  It is faster.
  - in qh_findbest, changed searchdist to MINvisible+max_outside+DISTround.
      MINvisible is the default MAXcoplanar.
  - cleaned up list management via qh_resetlists
  - uses facet->dupridge to indicate duplicated ridges instead of ->seen
  - qh_buildtracing records CPU time relative to qh hulltime instead of 0

                ========== changes to merging =======
  - many performance improvements, especially in high-d.
  - when merging, qh_findbest and qh_findbestnew stops search at qh_DISToutside
  - vertex neighbors delayed until first merge
  - post merges reported every TFn/2 merges
  - vertex merging turned off in 7-d and higher (lots of work, no benefit).
      vertex merging moved to qh_qhull_postmerging in 6-d.
  - replaced qh min_vertex with MAXcoplanar for determining coplanarity
  - pick closest facets to merge in duplicate ridge instead of flip/flip
      (see qh_matchduplicates in poly2.c)
  - optimize merge of simplex into a facet
  - optimize merge of a "samecycle" of facets into a coplanar horizon facet
  - cleaned up qh_forcedmerges/qh_flippedmerges and removed facet->newmerge
  - rewrote qh_merge_degenredundant with separate queue
  - qh_facetdegen replaced by facet->degenredun
  - flipped neighbors no longer merged in preference to flip/non-flip pairs
  - removed angle argument from qh_merge_degenredundant and qh_mergefacet
       only used for tracing
  - getmergeset_initial had extra test of neighbor->simplicial
  - ridge->nonconvex is now set on only one ridge between non-convex facets
  - moved centrum deletion to qh_updatetested
  - qh_isnewmerge(facet) changed to facet->newmerge (removed NEWmerges)
  - qh_findbestneighbor reports correct distance even if testcentrum
  - added hull_dim factor to qh_BESTcentrum
  - removed horizon preference in qh_merge_nonconvex (qh AVOIDold)
  - facet->keepcentrum if qh WIDEfacet or qh_MAXnewcentrum extra vertices

------------
qhull V2.02 1/25/95
  - rbox 'z' prints integer coordinates, use 'Bn' to change range
  - fixed rare bug in qh_check_maxout when qh_bestfacet returns NULL
  - fixed performance bug in findbestneighbor, should be + BESTnonconvex
  - renamed 'notgood' flag in 'f' option to 'notG' flag (caused confusion)
  - changed qh.hulltime to (unsigned) to prevent negative CPU times
  - added random perturbations to qh_getangle under the 'Rn' option
  - reviewed the documentation and enhancement list
  - added discussion of how to intersect halfspaces using qhull
  - replaced expression that caused incorrect code under an old version of gcc
  - added buffer after qh.errexit in case 'jmp_buf' has the wrong size
  - rewrote qh_printhelp_singular for lower-dimensional inputs
  - rewrote qh_printhelp_degenerate
  - added options for qh_RANDOMint in qhull_a.h
  - changed time format for 'TFn' to %02d

------------
qhull V2.01 6/20/94
  - fixed bug in qh_matchnewfacets that occured when memory alignment makes
    facet->neighbors larger than necessary.
  - fixed bug in computing worst-case simplicial merge of angle coplanar
    facets (ONEmerge).  This decreases (...x) in printsummary.

qhull V2.01 6/17/94
  - added recommendation for 'Qcm' to documentation and help prompts
  - added an input warning to qh_check_points ('Tv') if coplanars and no 'Qc'
  - qh_partitionpoint: always counts coplanar partitions (Zcoplanarpart)
  - rewrote qh_printhelp_degenerate to emphasize option 'C-0'
  - For Geomview output, roundoff is not needed when printing the inner and
    outer planes.  This improves Geomview output for the 'Rn' option.
  - For Geomview output without coplanar points or vertices, qh_GEOMepislon
    is not needed.  This removes the edge gap when displaying a Voronoi cell.
  - For Geomview output 'Gp', direct vertices to the interior point
    instead of the arithmetic center of the displayed vertices.

qhull V2.01 6/11/94
  - if pre-merge, 'Qf' is automatically set.  Otherwise an outside point may
        be dropt by qh_findbest().  This slows down partitioning.
  - always use 'Qc' if merging and all facet->maxoutside's must be right.
        Otherwise distributions with many coplanar points may occassionally
        miss a coplanar point for a facet.  This is because qh_findbest, when
        called by qh_check_maxout, can become stuck at a local maximum if
        the search is started at an arbitrary facet.  With 'Qc', the search
        is started from a coplanar facet.  For example,
                rbox 1000 W8e-6 t | qhull C-0 Tv
        will (rarely) report that a facet->minoutside is incorrect
  - option 'Pp' turns off "Verifying" message for 'Tv'
  - added qh_copynonconvex to qh_renameridgevertex (fixes rare error)
  - 'rbox tn' sets random seed to n
  - 'rbox t' reports random seed in comment line
  - qh_errexit reports rbox_command | qhull_command and 'QR' random seed
  - added additional tracing to bestdist and setfacetplane
  - in qh_checkconvex, need to test coplanar against 0 instead of -DISTround
  - in qh_checkconvex, always test centrums if merging.  The opposite
    vertex of a simplicial facet may be coplanar since a vertex of
    a simplicial facet may be above the facet's hyperplane.
  - fixed error handling in qh_checkconvex when merging
  - in qh_printsummary, one merge ratio not printed if less than 'Wn'
  - documented that 'Tv' verifies all facet->maxoutside

qhull V2.01 6/2/94
  - 's' prints summary to stderr
  - multiple output formats printed in order to stdout
  - added statistic for worst-case distance for merging simplicial facets
        can not hope for a better "max distance above/below facet"
        print factor for "max distance.."/"merge simplicial" in printsummary
  - fixed error in scaling input with min/max reversed ('Qb0:1B0:-1')
  - fixed error in scaling if project & Delaunay & scale ('d Qb0:0B1:0b2:0')
  - user_eg.c: qh_delpoint removed since it does not always work
  - user_eg.c now works for either convex hull or Delaunay triangulation
  - added PROJECTdelaunay for Delaunay triangulations and Voronoi diagrams
        with libqhull.a and user_eg.c
  - user_eg.c: if project or scale input, need to copy points
  - user_eg.c: default just defines main, added fprintf's for qh_errprint etc.
  - qh_gausselim: a 0 pivot no longer zeros the rest of the array,
          need the remaining elements for area computation
  - qh_qhull: restore cos_max, centrum_radius at end of POSTmerging
  - qh_checkflipped with !allerror is >=0.0 instead of >0.0
  - removed -Wall from gcc due to unnecesssary "warning: implicit declaration"
  - renamed 'new' variables and fields to allow compilation by g++
  - added README notes on C++, and "size isn't known"
  - updated manual on 'Qg' with coplanar facets and no merging ('rbox c D7')
      'Qg Pg' and 'Pg' produce different results because of precision problems

------------
Converting from qhull 1.01 to qhull 2.00
  - 'qhull An' is now 'qhull Wn'
        option 'Wn Po' is faster but it doesn't check coplanars
  - 'qhull g' is now 'qhull G', and the output formats are different
  - 'qhull c' is now 'qhull Tc'
  - 'qhull f' is now 'qhull Qf'
  - 'qhull o' is now 'qhull Po'
  - 'qhull b' is now always done
  - qhull and rbox now use floats, change REALfloat in libqhull.h for doubles
  - qhull 2.00 fixes several initialization errors and performanace errors
        e.g., "singular input" on data with lots of 0 coordinates
  - 'rbox b' is now 'rbox c G0.48'
  - all rbox distributions are now scaled to a 0.5 box (use 'Bn' to change)
  - rbox now adds a comment line.  This may be removed by 'rbox n'
  - 'rbox r s Z G' no longer includes the positive pole
  - no changes to the Macintosh version

qhull V2.00 5/23/94
  - if force output ('Po'), facet->maxoutside= 'Wn' since coplanars not updated
        convexity checked if precision problems or verify ('Tv')
  - if merging, new facets always checked for flipped orientation
  - a facet is visible (findhorizon) under 'Qm' if distance > max_vertex
  - if using 'Qm' then min. outside is max_vertex instead of max_outside
  - default is random()/srandom() in qhull_a.h, checked in initqhull_globals
  - created internal strtod since strtod may skip spacing after number
  - removed lower bound (1.0) for qh maxmaxcoord
  - divzero needs to handle 0/0 and large/small
  - decreased size of precise vertices
  - need to initialize qh MINdenom_1 for scalepoints
  - added factor of qh maxmaxcoord into DISTround (needed for offset)
  - 'Rn' perturbs distance computations by random +/-n
  - check_points needs an extra DISTround to get from precise point to computed
  - rewrote some of the IMPRECISION section in qhull.man
  - added the input format to the qhull prompt
  - moved include files to qhull_a.h since some compilers do not use float.h
  - added qhull.1 and rbox.1 since SGI does not ship nroff
  - reduced cutoff for printpointvect
  - use time for qhull random seed only if QR0 or QR-1
  - radius of vertices and coplanar points determined by pre-merge values

qhull V2.00 5/12/94
  - facet2point (io.c) used vertex0 instead of vertex1
  - can't print visible facets after cone is attached
  - shouldn't check output after STOPcone (TCn)
  - statistic 'Wminvertex' and 'Wmaxoutside' only if MERGING or APPROXhull
  - 'make doc' uses lineprinter format for paging
  - warning if Gpv in 4-d

qhull V2.b05 5/9/94
  - decreased size of precise vertices
  - precise facets in 2-d print hyperplanes
  - accounted for GOODpoint in printsummary
  - added IMPRECISION section to qhull.man
  - 'Qg' does work in 7-d unless there's many coplanar facets