  version 1.1:
  added patches for X11R3 - from duncan@mips.com
  quicker vader updating - from koreth@ebay.sun.com
  and bitdir - the BitmapDirectory resource, courtesy of me.
  Tue Aug  7 1990

  version 1.2:
  added multi-resolution code.  created new bitmaps for large-scale.
  added new resource for scale: Vaders*Scale, 1=normal, 2=large.

  version 1.3:
  added explosions for aliens.
  cleaned up some dirty code so the program will compile without 
   complaints from gcc and added applications-default directory search
   - from jik@athena.mit.edu

  version 1.4:
  added font resource for score display.
  remade Vaders window into a Form widget, with two children - 
   the gamewindow and the information window.
  cleaned up stuff so lint would be happy.

  version 2.0:
  added buttons for commands.
  added info screen [me!]
  folded bitmaps back into the code, removed bitdir.
  The application can now run without any customization of resources,
   or knowledge of the file system.
