Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Reincorporate documentation lost with update to nvi 2.1.3

Remove docs that are not shipped with nvi anymore

Reported by: emaste

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

$Id$ -> $FreeBSD$

<bsd.doc.mk> now includes ../Makefile.inc, so don't include it here.

$FreeBSD$ -> $Id$.
Removed Berkeley Id. We never did this like Berkeley (because cvs doesn't
handle symlinks) and no interesting Berkeley words are left.

Create a subdirectory for every document. This make it easier to use
the default formating rules from <bsd.doc.mk>, especially for
PRINTERDEVICE=html.