4.4BSD snapshot (revision 8.1); add 1993 to copyright

mdoc version three

bsd copyright

Deleted reference to type bitfields; since the compilers use shifts and
masks, a bitfield description will have byte order dependencies. Substituted
a reference to pcc.h instead.

rm sdb bug; more sdb left

4.3BSD beta release manual page

manual page distributed with 4.2BSD

manual page distributed with 4.1BSD