Small changes in GetHumanPhotopigmentSS.

Signed-off-by: Manuel Spitschan <mspits@sas.upenn.edu>
Changes in GetHumanPhotopigmentSS

Signed-off-by: Manuel Spitschan <mspits@sas.upenn.edu>
Merge branch 'master' of https://github.com/DavidBrainard/BrainardLabToolbox