Wrap goodFFTSize
(#430)
Use goodFFTSize for image size in OpticalPSF
(#430)
Various optimizations to optics calculations
(#430)
Use oversampling=1 by default
(#430)
Rerun generate_optics_comparison_images.  Only the optics_all test was failing, but all of them changed slightly when script was run.
(#430)