#55 tom/conesave.py demo missing glSavePPM

[Mike C. Fletcher]

Should use another function in this demo, and/or work
on this "missing functionality" that was removed
way-back-when when Tarn did his rewrite (save as jpeg,
save as ppm, a few other functions).

[Mike C. Fletcher]

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Okay, this is now fixed with a new method that uses PIL to
do the saving.