Update the function 'query_photometry'

1) Changes in the function 'tapquery' introduced in the previous
   commit required some updates in the function 'query_photometry'
2) The 'Cflg' quality indicator for the 2MASS catalog (II/246/out)
   is now considered.
3) The catalog KIDSS-DR6 Galactic Plane Survey (II/316/gps6) works
   again.