Add comments explicitly specifying DKL coordinate system convention.
Put back a missing semi-colon to supress annoying printout
Support for estimating rod spectral sensitivities roughly consistent with the CIE standard parameters for cones

Updated these routines to allow ComptueCIEConeFundamentals to take an
argument that allows it to return a rod spectral sensitivity consistent
with the pre-retinal absorption parameters embodied in the CIE
standard, but using estimates of rod photopigment absorbance and rod
axial density.

DHB, MS