various formating fixes, use NUL for NUL bytes..

drop out dated perf numbers (can't imagine people are still running
Pentium MMX 166's anymore)...

bump date...

drop max length of salt of 8 since _PASSWORD_LEN is now large, 128..
and state the max length of the salt depends upon the module,
sha-{256,512} have a max salt of 16..

recommend 8 characters of salt instead of just 2...

MFC after:	1 week