Remove $FreeBSD$: one-line sh pattern

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

mktemp: add -p/--tmpdir argument

This matches other mktemp implementations, including OpenBSD and GNU.
The -p option can be used to provide a tmpdir prefix for specified
templates. Precedence works out like so:

-t flag:
- $TMPDIR
- -p directory
- /tmp

Implied -t flag (no arguments or only -d flag):
- -p directory
- $TMPDIR
- /tmp

Some tests have been added for mktemp(1) in the process.

Reviewed by: imp (earlier version), wosch
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D37121

pkgbase: Put more binaries/lib in runtime

Move some needed binaries/libs from FreeBSD-utilities to FreeBSD_runtime.
This is everything needed to boot to multiuser with FreeBSD-rc installed.

MFC after: 2 weeks
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D33435

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.

Remove leaf node WARNS?=2 (that mainly I added). This should
help the GCC3 transition and CURRENT in general.

Warns cleanups.

Bring in an old faithful tool I've been using for just over 4 years now
(originally on a different OS without mkstemp()), albeit somewhat
bashed and hacked into something that doesn't look too much like
the original any more. It should be upwardly compatable with
OpenBSD's mktemp(1) but does a couple of extra things.

I've taken OpenBSD's mktemp.1 man page and adapted it to suit.