Updated ReadExtensions for GrassCoverErosionInwards: - Added support for the calculation output to read the illustration points entities - Extended GeneralResultEntityTestHelper to assert the read GeneralResult: -- Updated XMLDoc and added testcases - Added ArgumentNullException for the GrassCoverErosionInwardsOutputEntityReadExtensions when entity is NULL Related to Issue [WTI-1319] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@11079 5a3db67b-de53-47b5-99c8-a1c30a6650e2