Basic tests and comparisons of PsychOptics routines

Basic tests and comparisons of PsychOptics routines, in particular our ability
to go back and forth between LSFs and PSFs and between PSFs and OTFs.

Also useful for remembering the usage of various routines.  
This also makes some useful plots that compare different estimates of  
monochromatic human optics from the older literature.  These estimates  
are probably not as good as using wavefront methods (see isetbio at for data and code), but it is useful to have them for  
comparing with calculations in the literature that used these estimates.  
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