GLSL version available

A GLSL version of the simple HyperBalls demo can now be downloaded from the Sourceforge website (http://sourceforge.net/projects/hyperballs/files/HyperBallDemo_V0.1_glsl.tgz/download). The GLSL version is compatible with a wide variety of graphics cards. Still, the graphics card must support at least Shader Model 3.0.