Complete stylistic rewrite.

I was inspired by the OpenBSD project's recent KNF carpetbombing of
OpenSSL to fix all of ytsm's formatting problems. Almost everything now
wraps at 80 characters, a few if statements were changed to case,
several excessively long comments were shortened. Users should see very
few differences, but anybody hacking on ytsm will hopefully have an
easier time doing so.