record RA and DEC of galaxy center from galfit and ellipse fitting

[rfinn]

• we have center coordinates in pixels, but this is relative to cutout
• would be useful to have this is RA and DEC

[rfinn]

Added four more columns to output table - yikes!

• GAL_RA, GAL_DEC
• ELLIP_RA, ELLIP_DEC

These are the central coordinates determined by galfit and photutils, respectively.