Remove $FreeBSD$: two-line .c pattern

Remove /^#include\s+<sys/cdefs.h>.*$\n\s+__FBSDID\("\$FreeBSD\$"\);\n/

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.

Move unistd.h includes to individual .c files and remove unnecessary
includes.

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

ANSIfy function prototypes. While I am there, constify some parameters and
make use of C99 sparse initialization for static variables, this makes talk(1)
to compile cleanly with WARNS=6.

Use socklen_t where appropriate.

remove whitespace at end of line

WARNS=2 fixes with NO_WERROR set because of system-header originating
warnings. Use __FBSDID().

$Id$ -> $FreeBSD$

Add #include <string.h> to get prototype for memcpy().

Add rcsid. Remove unused #includes (what about RU# ?). Change exit(-1) and
add usage().

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Increment network byte order properly
Reviewed by: wollman

Make talk automagically find out the interface IP address where the
remote peer will be connected through. This avoids the ``Checking for
invitation on caller's machine'' problem for multi-homed hosts.

Thanks to: Garrett, for his `find_interface' example