Rendering Features Page added to Wiki

[James W. W. <os...@jw...>]

Quesa's wiki has a new page describing several advanced rendering  
techniques: Shadows, per-pixel lighting, and full-screen antialiasing.  
This is just to collect some information that previously appeared in  
list posts and release notes.

See:  <http://quesa.wiki.sourceforge.net/OpenGL+Rendering+Effects>