README.rest: word order tweak

to suggest that "reasonably" applies to all of "portable, fast,
thread-safe, BSD-licensed", not just.
rst2html w/o --strict is kinda pointless

rst2html lets many structural problems and even some
syntax errors pass without this option.
LICENSE: formatting, s/FREEBSD PROJECT/AUTHOR/

late proof-reading is better than no proofreading, right?
README.rest: licensing section
LICENSE tweak
tests: pmp has outlived its usefulness

i used it as a practical tool to validate my understanding
of cmp(1) behavior; pre-recorded good results from cmp are
plenty enough for the tests.