Introduced PipingOutputContext to hold references to PipingOutput and PipingSemiProbabilisticOutput. Added intermediate results from PipingOutput to the piping output property control. Related to Issue [WTI-1004] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@6988 5a3db67b-de53-47b5-99c8-a1c30a6650e2