Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Revert r256095, r256120 (partial), r256121:

r256095:
- Add gnu/usr.bin/rcs back to the base system.

r256120:
- Add WITHOUT_RCS back to src.conf.5.

r256121:
- Remove UPDATING entry regarding gnu/usr.bin/rcs removal.

Requested by: many
Approved by: re (marius)
Discussed with: core

$Id$ -> $FreeBSD$

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.

First part of import conflict merge from rcs-5.7 import.

All those $Log$ entries, combined with the whitespace changes are a real
pain.

I'm committing this now, before it's completely finished to get it compiling
and working again ASAP. Some of the FreeBSD specific features are not working
in this commit yet (mainly rlog stuff and $FreeBSD$ support)

This commit was generated by cvs2svn to compensate for changes in r11891,
which included commits to RCS files with non-trunk default branches.

Import rcs-5.7, required for full support of cvs-1.6.

This is going to be pretty messy.... Although the vendor import was correct,
both the vendor and release tags are the same "gnu"... :-/
Getting cvs to choose the correct one might be rather interesting...