Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r232297: Grammar: tzsetup now has more than one option.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

- add missing options and arguments to program's usage()
and sync it with manpage's SYNOPSIS

- generally clean up a manpage's formatting

Reviewed by: edwin

- Add support for chrooted installs.
- Add examples to the man-page.

MFC after: 1 week

Instead of having to know which timezone was picked last time, you
now can run "tzsetup -r" which will reinstall the last choice. This
data is recorded in /var/db/zoneinfo.

MFC after: 1 week

Make the usage of the default zoneinfo file to install clearer.

MFC after: 1 week

Add a new options (-s) that, when specified, skips the question about
adjusting the clock to UTC.
That avoids to write on /etc/wall_cmos_clock which is useful in some
cases (example: host user in a jail).

Sponsored by: Sandvine Incorporated
Initially submitted by: Matt Koivisto <mkoivisto at sandvine dot com>
Approved by: re (kib)

Sort sections.

Mechanically kill hard sentence breaks.

The .Nm utility

mdoc(7) police:

Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text.
Not only this slows down the mdoc(7) processing significantly, but it also
has an undesired (in this case) effect of disabling hyphenation within the
entire enclosed block.

Remove whitespace at EOL.

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: use the new features of the Nm macro.

Use Fx macro wherever possible.

Convert err() to errx(), reason is already provided. Complete the
abort on allocation failure instead of deferencing NULL later.

$Id$ -> $FreeBSD$

Add a `default' feature to tzsetup for use in script-driven installation
(if someone writes the other half). Also rewrite the man page in a more
appropriate (formal) style.

Add usage(). Document -n flag. Do not touch/remove /etc/wall_cmos_clock
when -n (do nothing) is used.

Fix a minor nit in the .Dd macro invocation so that
the revision date is displayed correctly.

Revert $FreeBSD$ to $Id$

Sort cross references.

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.

sync copyright with /usr/share/examples/etc/bsd-style-copyright

Convert "time zone" to "timezone" in NAME section

Submitted by: obrien@cs.ucdavis.edu (David E. O'Brien)

add a manpage