figure out why galfit sersic index is underestimated

[rfinn]

• this is likely due to an issue with my psf
• add more galaxies for the comparison (I've done only 19/31 for NRGs27)
• repeat for MKW8 field
• could also be an issue with combining images with different fwhm when making the coadd. better sequence is to match fwhm of individual frames BEFORE running swarp to make coadd.

[rfinn]

• it might be that I was using the wrong psf, or possibly no psf.
• need to rerun this and test again with NRGs27

[rfinn]

• also, check convolution area - make sure this is big enough?