plasma in python - 1.1

A demo effect using a palette in 8-bit mode to create a visually appealing experience. This program is based on C++ code written by Alex Champandard, from an article on demomaking (url: http://www.flipcode.com/archives/The_Art_of_Demomaking-Issue_04_Per_Pixel_Control.shtml).

Version 1.1: Took out the confusing back-and-forth motion; the demo now jumps to a new scene every 30 seconds or so. Also made the centered text optional by command line or global variable.