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

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

Remove clause 3 from Berkeley copyrights. Add a few $FreeBSD$'s.

Changed idempotent strings to reflect directory area.
Reviewed by:
Submitted by:

This commit was generated by cvs2svn to compensate for changes in r1539,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite Include Sources