typo
add convertInclination function

should supercede getInclination since it allows for thick disks,
taking any two args of galBA, galCA, and inc and returns the 3rd. So
getInclination should be equivalent to convertInclination when
inc=None, galCA=0, and galBA=gal_q. Still TBD is to clarify whether
galBA is the intrinsic or observed axis ratio, and how to switch
between the two.
started test_image to compare galsim and bessel image profiles

see also scratch/make3dgal.py
testing script to make 3d galaxy profiles with bessel funcs

Trying to generate projected exponential surface brightness profiles
using Spergel's basis of Bessel functions to produce the 3d profiles.