fixed params for retina strength 
fixed params for retina strength 

git-svn-id: http://svn.code.sf.net/p/petavision/code/sandbox@6216 7c0444ca-5550-0410-9008-faecdbe78eb5

Former-commit-id: c57bd19e0a7016fd31f1e393dd4740bd98e0b1ae
PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV