- build common/* once, into a library, rather than recompiling each of
the files multiple times in the other subdirectories (saves about
10% on compilation time)
- clean up the manual pages

Fix compiler warnings (and an awful lot of annoying little bugs).

Back out the .PATH.c changes. The .depend problem (and others)
will be fixed using the new .NOPATH make feature instead.

Use .PATH.c: ...

A ypserv implementation, originally written by Mats O Jansson, with
some changes by me, including misc. cleanup, minor bug fixes, and
brand-new access control list code.