param_draw now will now attempt to infer pre- and post-layers from connection names when said parameters are absent
param_draw now will now attempt to infer pre- and post-layers from connection names when said parameters are absent

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