Implemented the conversion from ngmix galaxy to GSObject for gaussian catalogs, as well as restructured much of `ngmix2gs()` to handle more general catalog types efficiently.
Implemented the conversion from ngmix galaxy to GSObject for gaussian catalogs, as well as restructured much of `ngmix2gs()` to handle more general catalog types efficiently.

sweverett/Balrog-GalSim,sweverett/Balrog-GalSim