Still developing radial profile design.

Included an inverse profile method, which will probably get eliminated.
Chopped inverse profile method
Closing in on the classical spatial bias profile model component.

Need to figure out how to address the special case where
I run a spline from a table given by
only a single abcissa/ordinate pair. Spline bails if passed
degree 0. This also needs to be fixed in vdB03_Quiescence.
Nearly finished writing a fully general galaxy profile model.

Had to write my own method to treat special edge case of
scipy's spline routine.
Changed vdB class to use aph_spline
Starting to write binned_heaviside feature of occuhelp
Finished binned_heaviside method. Still needs further testing
Wrote profile_modulating_function