CIDEVMI-1069: OPTAA tscor wavelength range extension

Extended tscor dictionary wavelength keys from 400.0nm to 380.0nm and from 755.0nm to 775.0nm and padded these entries with np.nan values so that OPTAA wavelengths in the extended range will not cause look-up errors.



@s-pearce Ready for review and merge.
@cwingard Ready for review and merge.