Added SaturatedVolumicWeightOfCoverageLayer as input for PipingCalculator (not yet in interface) Added IPiezoHeadCalculator and the implementations to wrap the static call to the piping kernel and be able to verify the input of the calculation. PipingCalculationService.CalculateThicknessCoverageLayer no longer throws exceptions, but handles it just like the other service calculation calls. Added PipingCalculationService.CalculatePiezometricHeadAtExit to be able to show it in the interface. Related to Issue [WTI-383]