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)

Add FreeBSD IDs to some files and make the others consistent in style.

Allow the use of ${DESTDIR} in the enviroment to optionally get
these various collections to install someplace else.

Check in the shell scripts I used for the 2.1-RELEASE CDROM. These
are provided simply as easy short-cuts for users who are prowling through
the dists structure and decide to install something directly from there.

There still needs to be some glue stuck into release/Makefile to copy
these into the appropriate homes following a full `make release', but I'll
wait until phk is done in there.