This adds the file-centric perforce browser to the guest depot.
I rewrote it (again) this week to split out a simpler,
non-javascript version that is easier to install (and doesn't
need the CGI package). Both are included here.
I still need to rewrite the INSTALL.txt file to reflect this,
and update the README.
I'd love to have a MakeMaker script to install this, but I
haven't done that before, so I've got some trepidation.