* Renamed PipingSurfaceLine to RingtoetsPipingSurfaceLine to prevent ambiguity with kernel's PipingSurfaceLine. * Selected RingtoetsPipingSurfaceLine now transformed to kernel's PipingSurfaceLine and used in calculation. * Added validation prior calculating piping to check if surface line is selected. * Fixed update bug due to PipingCalculationInputs refactoring, by making it IObservable and defer implementation to PipingData. Related to Issue [WTI-21] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@390 5a3db67b-de53-47b5-99c8-a1c30a6650e2