- Investigate failed MIME-type detection by Gtk2::FileFilter

- Set icon and class properties on top level windows (maybe)

- See about configuring Seamonkey, ROX action prefs

- Find out just why vsuper-gtk2.pl dialog insists on continuing to display
  after being destroyed

- Cause widgets to become insensitive instead of raising error messages (not
  really needed)

- Finish documentation
