-voronoi_utility.py:
	-currently: trying to improve code performance based on practical profiling results
	-currently: working to numpy vectorize voronoi_region_vertices_spherical_surface() function
	-incremental improvement to voronoi_region_vertices_spherical_surface() [not fully vectorized yet, and actually runs slower, but hopefully will pay off when fully vectorized]
-voronoi_utility.py:
	-currently: trying to improve code performance based on practical profiling results
	-currently: working to numpy vectorize voronoi_region_vertices_spherical_surface() function (the partially vectorized intermediate state actually runs much more slowly than the original--hopefully the fully vectorized version will pay off)
	-the above function still isn't fully vectorized, but moving in that direction with pandas usage in this commit