[Soc-2010-dev] Status report for multires

[Nicholas Bishop]

Status report for May 24-28:
* Committed only some very basic things like new CustomData types, and
for masks, a test UI and test operator.
* Relearned how the various DerivedMeshes work with modifiers and CustomData.
* Started modifying gpu_buffers to add a color buffer, will be used
first for displaying masks.

Plans for next week:
* Finish the color buffer code. Once this is done it becomes much
easier to test everything else, since results will be visible on the
mesh.
* Continue work on facegrid CustomData so that it interacts with CCGDM
correctly, and then with MultiresDM.

-Nicholas