This is a simple program to show fireworks display in a window.  The window
may be resized.  Clicking in the window will cause the program to exit.

If the "-root" flag is given, then it will display in the root window.
(Currently, "-root" does not work if dxwm is running.)  In this case,
the program has to be manually killed to make it exit.

The interesting part is that all the work is done by PostScript in the
server.  The client does nothing but handle events.
