Replaced V1 with LIF.
Replaced V1 with LIF.

git-svn-id: http://svn.code.sf.net/p/petavision/code/sandbox@3375 7c0444ca-5550-0410-9008-faecdbe78eb5

Former-commit-id: 41b68896ff62de9df2c179bcb0c81c4a5ba10542
PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV