Description of Problem:

The `webcollage` app in xscreensaver writes out a bunch
of files to /tmp. From a quick look at the code, it doesnt look
to be the most paranoid app around.

Not really a big deal since we dont let users select
`webcollage` from any conveinent manner, and xscreensaver
is designed not to run as root. Just figured I'd file
it while it was on my mind...

The /tmp files are just "webcollage.$PID" so very predictable,
and doesnt look there are any attempts to use mkstemp or
the like.