* Extended IFailureMechanism with IsRelevant flag. * Forwarded this new flag to FailureMechanismContributionView and made it an editable column. ** Extended PipingFailureMechanismItem with NotifyFailureMechanismObservers method to allow FailureMechanismContributionView to notify observers of the failure mechanism on the property change. Related to Issue [WTI-428] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@2964 5a3db67b-de53-47b5-99c8-a1c30a6650e2