interactive game demo for gnuplot

[Juhász P. <pet...@gm...>]

Dear gnuplot list members,

Struck by sudden inspiration (and also motivated by the feel that the
"new" control flow capabilities are not advertised enough in the
existing demos), I wrote a small game demo, in pure gnuplot. I donate it
for the demo suite.

I haven't committed it to cvs straight away because for some reason it
does not work with the wxt terminal. It works with x11, I haven't tested
others.

Have fun!

Peter Juhasz