Cleaning up disk space on cl.net

Due to a shortage of disk space on common-lisp.net, I have removed many 
of the old binaries from the binaries and experimental directories.

I've also removed all snapshots up to 2005.

But not to worry.  I have been making archives of the cmucl repository, 
so I have all of these saved away on disk and on DVD.  When more disk 
space is made available again, I will upload all old snapshots again.  I 
will probably not restore the old files to the binaries or experimental 
directory.

Ray