Tangential projection implemented.
Border layer added, function to return projection border added.
Old visualizer files removed.
RotateBack functions added.
Masking of rotated projections fixed.
Mask singularity issue circumvented by moving mask halfspace a bit away from sphere center.
Fixed ASin domain issue in triangle area calculator for very large angles.
Minor code clean up in PatchFactory.
Test added to test very large triangle area problem.