Added the following options: adf, ceiling, com1, com2, dme,
(en|dis)able-clock-freeze, (en|dis)able-enhanced-lighting,
(en|dis)able-horizon-effect, (en|dis)able-hud-3d,
failure, nav1, nav2, and timeofday
Updated descriptions for enable-hud and fdm
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).