[PD-dev] [GEM] CVS changes

Forgot to post the changes tigital and I commited to CVS over the weekend:

- added/fixed some yuv code. this will be the last yuv_ stuff added and now we'll start rolling yuv into pix. altivec code has been started and that will make it into the yuv part of pix_ in the next month or so.

- fixed pix_gain yuv code. it doesn't crash and generally works

- fixed pix_texture so that it now actually passes texcoords to geos for non-power of two textures. it works as it should on OSX, but someone needs to double check the other platforms.

- changed the color channel order in GemPixUtil.h so ARGB colors are correct.

lots more to come...

cgc