Fixed linux compile errors.
Linear elements with Curved solution is working. Moving on to curved elements.
Added initial Planar/CurvedIdx.
Updated many uses of face indices to use the new Index class.
Added comments and restored commented code.
Fixed warnings.
Removed unsafe automatic converstion of Global->Planar and Global->Curved indexing.
Merge remote-tracking branch 'blake/OptiXModel' into PX

Conflicts:
	src/ElVis/Core/FindElement.cu
I just get segfaults now...