replaced a reference to protected data member conn->pre with public member function conn->preSynapticLayer()
replaced a reference to protected data member conn->pre with public member function conn->preSynapticLayer()

git-svn-id: 602a26e73ae9f2a14e2bb95676f2e137fcc39919@3302 7c0444ca-5550-0410-9008-faecdbe78eb5

dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV