R200 ToDo

1. Figure out various tiling on r200 (colorbuffer already done, texture tiling need some work)
2. Abjust r200_blit.c to work between tiled/untiled surfaces
3. Figure out how to upload and use hardware vertex buffer objects on r200 (and r100?)
4. Add support for pixel_buffer_object
5. Use some "meta" code in mesa for more acceleration (glbitmaps .... ) ...