moving testing scripts to git

CMakeLists.txt

utils/nightly/gmsh.ctest

utils/nightly/gmsh_linux32_nightly.ctest

utils/nightly/gmsh_linux32_test.ctest

utils/nightly/gmsh_linux64_nightly.ctest

utils/nightly/gmsh_linux64_test.ctest

utils/nightly/gmsh_mac_nightly.ctest

utils/nightly/gmsh_mac_test.ctest

utils/nightly/gmsh_msvc_nightly.ctest

utils/nightly/gmsh_win32_nightly.ctest

utils/nightly/gmsh_win32_test.ctest

utils/nightly/gmsh_win64_nightly.ctest

utils/nightly/gmsh_win64_test.ctest