[aquaria] THE GUILY (was Unofficial PSP port)

[Ryan C. Gordon]

> FWIW, I can confirm that the non-framebuffer version of the dark layer
> code works correctly, since I haven't (yet?) implemented the OpenGL
> framebuffer extension on the PSP and the dark layer still renders fine.

Out of curiosity, is the dark layer used at all outside of The Abyss 
(and a few other places)? Should we be skipping this processing for most 
maps?

--ryan.