TODO: 
- banner: don't put background under title, just render it with alpha blending
- limit running apps to one if not embedded ?
- trap kill => kill pending apps
- fixed resizing hack: don't do it if less that 5 icons
- consolidate gdk-pixbuf code
- once perl-gtk for gtk+2 is there, use a Gtk::Table (or better gimp widget for
  its tool icons table) filled with Gtk::Image, thus killing lot of code (dbl*
  buffers, rerending, alpha blending, ...)
- add mmc theme so that drakx tools get mcc background
- xinerama compliant: look in gdm