Changed test-time assertions for unittest.TestCase.assertTrue as failing assertTrue causes a Failure instead of an Error, which is the expected behavior.
Added use of ${PYLEARN2_DATA_PATH} in wiskott instead of the hard-coded /data/lisa/data. Modified testing.skip.skip_if_no_data so it takes an optional 'rel_dir' argument to skip the test if the folder doesn't exist under ${PYLEARN2_DATA_PATH}.
Added tests for adjust_for_viewer and adjust_to_be_viewed_with