-wrote new unit test for surface area reconstitution of sphere NOT centered at the origin -- test_spherical_voronoi_surface_area_reconstitution_non_origin() -- this passes, but the success is sensitive to the nature of the translation vector (numerical / floating point sensitivity?!)
-adjusted Voronoi_Sphere_Surface so that instances can account for sphere data sets that are not centered at the origin
-some updates to docstring in Voronoi_Sphere_Surface class