KNOWN BUGS:

* X Windows interface does not use GTK

* X Windows interface does not display different icons for robot
facing N, S, E, W.

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FIXED BUGS:

* command line parsing is nonstandard.  Should use GNU Getopt.

* command line parsing does not recognize standard GNU options, like
'--help' or '--version'

* there is no way to generate a usage statement - the program always
runs the default robot program.
