Implemented feature on the Piping FailureMechanism: - Replaced the checkbox with a dropdown column containing the AssessmentLayerOneState value - Fixed failing/not working tests - Removed test that asserts the toggling of the checkbox: test is obsolete because it's replaced with a dropdown box - Extended test for assessing that the right columns are visible when a failure mechanism is present Related to Issue [WTI-985] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/branches/WTI-985@6651 5a3db67b-de53-47b5-99c8-a1c30a6650e2