subjects not in UAT

[trjaffe]

The subject metadata should use the UAT vocabulary but frequently does not.

Found 872 Registry res_subject entries that are not in the UAT
  The top 10 bad subject values by number of instances are
Wide-band photometry     : 2276
Survey Source                    : 651
Sky survey                    : 445
asteroid-dynamics         : 194
 ''                                       : 153
visible-astronomy            : 139
virtual-observatories        : 138
extragalactic survey          : 101
Observation                    : 81
Stars                    : 80