Added read and create extensions: - Done for the output - Synchronised implementations of piping with MacroStabilityInwards => when NULL arguments are passed, ArgumentNullException thrown - Replaced CollectionAssert with TestHelper assert which uses an EqualityComparer - Introduced entity test helper to assert the macro stability inwards output entity values Related to Issue [WTI-1379] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@12118 5a3db67b-de53-47b5-99c8-a1c30a6650e2