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

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

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

Approved by: re (implicit)

Remove $Log$ keyword and associated history, which can cause annoyance in
diffs in some cases. Revision control tools have a history command to
obtain this information.

Remove some $Log$ debris

$Header$ -> $FreeBSD$

$Id$ -> $FreeBSD$

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.

Many of John T. Kohl's patches from NetBSD. Thanks, John!
Submitted by: jkohl

Cleaning house.