Added inhibition (may not be turned on).
Added inhibition (may not be turned on).

git-svn-id: http://svn.code.sf.net/p/petavision/code/sandbox@1882 7c0444ca-5550-0410-9008-faecdbe78eb5

Former-commit-id: 37b95e4b54163fac68d2d116850f7522fdc88caa
PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV