Set CMB_TEST_DATA_DIR for non-developer builds
CMB's input test data is now located in smtk/data folder. If the smtk project is built in the superbuild (that is, not a developer build), then set the path to the smtk/data folder for CMB.
CMB's input test data is now located in smtk/data folder. If the smtk project is built in the superbuild (that is, not a developer build), then set the path to the smtk/data folder for CMB.