Renamed few OxidTestCase methods so that all backup methods would have the same naming. Running tearDown only when no value is returned by test, as when something is returned, some tests probably depend on it and does not want everything cleaned, so tearDown should not restore anything.
Removing PHPUnit/Framework/TestSuite.php include in AllTestsRunner, as it is not needed to be included and does not work when run with phpunit.phar.