Commenting out conductivity
update_aux method to update the conductivity
update_aux routine
Going back to just updating conductivity in update_aux routine.
Separate method to calculate q at each gridpt in order to avoid multiplicity of loops
change calculation of bulge mass.
Modifying src_s to be consistent new conductivity.
Fix cond_grid
Some modification to the conductivity plotting routines in galaxy.py and catalog.py.