Remove $FreeBSD$: one-line bare tag

Remove /^\s*\$FreeBSD\$$\n/

Add a new Y flag to newsyslog.conf

This makes newsyslog use zstandard to compress log files.

Given Z is already taken for gzip and zstandard compression level stands in
between gzip and xz (which has the X flag) chosing Y sounds ok :)

Add xz(1) support to newsyslog.
Rewrite and simplify logfile compression code.

Approved by: gad
MFC after: 3 weeks

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.

Add the ability to Bzip2 your logs.

PR: 27901
Submitted by: Anders Nordby <anders@fix.no> (stylistic changes by me)

$Id$ -> $FreeBSD$

A slight bit of code and doco cleanup, but mostly:

Add the much-needed and long-desired ability to force the log rotation
to take place on a specific day or time, and document same. This works
by extending the syntax of the `when' field to allow a restricted
ISO 8601 time specification, and performing the log rotation if newsyslog
is run during the same hour as is specified.