Fix the fact that fvwm was not running autocutsel

Also, X settings were not getting initialized properly when I logged in
to Xubuntu; it took quite a bit of work to track down that FVWM somehow
knows, even when I hide it behind a script to take away any session-
related command line arguments, that it is "inside" a session and so it
invokes the "SessionInitFunction" instead of the normal one.