removed arguments from execution of test_gauss2d and test_mirror_BCs in runtests, since those tests no longer take arguments but hardcode their respective params files in main().
removed arguments from execution of test_gauss2d and test_mirror_BCs in runtests, since those tests no longer take arguments but hardcode their respective params files in main().

git-svn-id: 602a26e73ae9f2a14e2bb95676f2e137fcc39919@4298 7c0444ca-5550-0410-9008-faecdbe78eb5

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