Remove $FreeBSD$: one-line sh pattern

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

Fix warning about signed comparison and drop WARNS for ktrdump(8).

Reviewed By: jhb, imp
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D29381

Convert to usr.bin/ to LIBADD
Reduce overlinking

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.

Build usr.bin/ with WARNS=6 by default.

Also add some missing $FreeBSD$ to keep svn happy.

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

Added missing DPADD detected by ``make checkdpadd''.

Add a man page.

Submitted by: davidc

ktrdump is a utility to dump the ktr trace buffer from userland. It can
also be run on a core dump.