Add man pages for those programs that did not have one (exceptions:
yasim and yasim-proptest) and update the existing ones to make them
compliant with man-pages(7) conventions.
It is Debian Policy to have a man page for all binaries.
Ove has several Wishlist items in the Debian Bug Tracker for this, so I
decided to whip the main `fgfs` manpage together and started one for the
`fgjs` utility (which I've never actually used).