Break out test_draw stuff into their own file
(#426)
Break out some of the helper functions into galsim_test_helpers.py so they can exist in just one place even when multiple test files use them.
(#426)
Break out the various transform tests (shear, shift, rotate, etc.) into their own file
(#426)
Break out the convolve, add, etc. tests into test_compound.py
(#426)
Move test_sbinterpolatedimage to test_InterpolatedImage.py
(#426)
rename test files to lowercase to make consistent with most of the other files
(#426)
Finish rename procedure (workaround for apple's not-really-case-sensitive file structure
(#426)
Remove some files that haven't ever been used or needed.
(#372b)
Move test_gsobject tests into more appropriate files
(#372b)
Merge pull request #428 from GalSim-developers/#372b

#372b Some file rearrangement in the test suite