19971116
	version: djbfft 0.50, alpha.
19971218
	version: djbfft 0.55, alpha.
19971226
	version: djbfft 0.60, alpha.
19980923
	version: djbfft 0.70, beta.
19990914
	version: djbfft 0.75, beta.
19990929
	opt: added opt=ppro, lightly tuned for the Pentium Pro.
	internal: added x86cpuid to reliably distinguish P from PPro.
19990930
	version: djbfft 0.76, beta.