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

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

$Id$ -> $FreeBSD$

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.

- Add a BSD-style copyright. (Should have done that before.)
- Be more intelligent about library-like objects that are actually
symlinks. (Suggested by Steve Price)
- Complain about nonexistent libraries referenced by executables (instead
of creating a library called 'not' and putting them there. (oops)
- Fix a few typos.

This commit was generated by cvs2svn to compensate for changes in r21183,
which included commits to RCS files with non-trunk default branches.