sigma_xx -> sigma_x and same for y
Merge branch 'master' of https://github.com/alvarezcl/galsim_work
Merge branch 'master' of https://github.com/alvarezcl/galsim_work
Merge branch 'master' of https://github.com/alvarezcl/galsim_work
Code to make Sersic gals, and first attempt to fit them also.