As requested in DM-13154, add plots with density information to the "noFit" color-color plots.  These include both stars and galaxies (to visualize where the most contamination from the latter may sneak in in the case of bad star/galaxy seperation).  Currently, the points in these plots are color-coded by magnitude.  We do not want to lose this information, so explore adding contours for the density as well as just having two panels with different color-codings (as the former may get too messy).