-implemented unit test for generator data set on sphere with radius (somewhat) greater than 1.0 (for caveats: see below)
-minor improvements to misc aspects of unit test code
-removed some spurious code from calculate_and_sum_up_inner_sphere_surface_angles_Voronoi_polygon()
-adjusted calculate_and_sum_up_inner_sphere_surface_angles_Voronoi_polygon() to handle spheres with radii other than 1.0 (but 1.9999 or 87.0 fail while 2.0 works -- seems to be sensitive to both the magnitude and the number of decimal places -- basically sensitive to floating point issues but this is the best I can do for now)