Remove $FreeBSD$: one-line sh pattern

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

mtest: build with WARNS=3

Use src.opts.mk in preference to bsd.own.mk except where we need stuff
from the latter.

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.

Merge IPv6-capable mtest(8) from MLDv2 branch.

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

Reduce WARNS count due to alignment warning on ia64.

Merge a slightly cleaner and SSM capable mtest(8).

Submitted by: Wilbert De Graaf
MFC after: 1 month

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Set the default manual section for usr.sbin/ to 8.

Make mtest build. Write a makefile and a man page.