Python and cellular automata (It works this time!)

[bearophileHUGS at lycos.com]

Few coding suggestions:
- Don't mix spaces and tabs;
- Don't write line (comments) too much long;
- Don't post too much code here;
- For this program maybe Pygame is more fit (to show the images in real
time) instead of PIL;
- Maybe Psyco can help speed up this program;
- Maybe ShedSkin will support part of the cimg library, such kind of
programs is fit for it :-)

Bye,
bearophile