* Extended PipingFailureMechanism such that it can contain multiple calculations (PipingData instances) * Added context menu to PipingFailureMechanismNodePresenter to add additional piping calculations. Related to Issue [WTI-23] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@458 5a3db67b-de53-47b5-99c8-a1c30a6650e2