Added photometric systems for SkyMapper and PanSTARRS:

modified:   refdata/filter_passbands.fits
modified:   src/photometry/filter_passbands.sl
modified:   src/photometry/photometric_magnitudes.sl
modified:   src/photometry/process_photometry_from_VizieR.sl
modified:   src/plotting/xfig_photometry.sl
modified:   templates/photometry.sl