Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

random(6): Re-add undocumented support for floating point denominators

And document it in the manual page.

PR: 244139
Submitted by: Keith White <kwhite AT site.uottawa.ca> (earlier version)

random(6): produce random results

This program is trash and there's no reason to keep it in base. But as long as
we're shipping a silly program named 'random', let's actually make it random.

Final step of eliminating the "games" distribution: Merge src/games
(or what's left of it, at least) into src/usr.bin.

This change will not be MFCed.

Discussed at: EuroBSDCon 2014
Committed from: EuroBSDCon 2015