Different implementation of Poisson distribution. Added refractory period. Also, comments = happiness
Different implementation of Poisson distribution. Added refractory period. Also, comments = happiness

git-svn-id: http://svn.code.sf.net/p/petavision/code/sandbox@7529 7c0444ca-5550-0410-9008-faecdbe78eb5

Former-commit-id: 29e0a7a4ddb2cfb04ca30756ee9f90a24b8d57e1
dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV