man pages up to mdoc guidelines and fix some minor formatting glitches. Also fixed a number of man pages to not abuse the .Xr macro to display functions and path names and a lot of other junk.
man pages. Masanobu Saitoh <msaitoh@spa.is.uec.ac.jp> Giles Lean <giles@nemeton.com.au> <soda@sra.co.jp>