DELTASPIKE-342 added test for injection in base-class
DELTASPIKE-488 grouped-conversation tests
DELTASPIKE-493 WindowContextImpl#closeWindow fixed
DELTASPIKE-495 dsWindowContext

 (+ cleanup of javadoc and unused parts)
DELTASPIKE-488 improved compatibility
DELTASPIKE-488 cleanup
DELTASPIKE-491 @ConversationSubGroup
DELTASPIKE-342 basic support for @Before and @After
DELTASPIKE-491 changed test-beans

 (due to OWB-923)