Added blank load for PCA
Dummy writeback for demonstration.
Implemented alternative loading scheme with global accesses grouped
Calculated centroid of each region.
Added curvature estimates for other two normal estimation modes.
Rearranged API to provide more control.
Started to work on segmentation.
Fixed all pipeline change compile bugs.

Still need to implement new functionality and replace removed functionality.
Restored curvature estimate calculation, shortened maximum depth, and moved subsampling computation to a later pipeline stage.