HEADS-UP: new feature: removing of obsolete files

[M. Warner Losh]

In message: <20050723165510.0ba168d0 at Magellan.Leidinger.net>
            Alexander Leidinger <Alexander at Leidinger.net> writes:
: I covered nearly 6 years of obsolete files in this commit, but I may
: have missed some. I also tried to add a short comment why a files was
: removed. So in case you find a wrong comment or a file which isn't
: covered by this commit feel free to send a patch or commit it on our
: own.

Bravo!  I have lists of FreeBSD trees going back to 1.0, but haven't
had time to write the script to find those files no longer in current.

Warner