Introduced a NewGrassCoverErosionInwardsCalculationActivity which will replace GrassCoverErosionInwardsCalculationActivity. Added NewHydraRingActivity which will replace HydraRingActivity Added parsers which throw exceptions Added calculator for overtopping to be able to perform a complete GrassCoverErosionInwards calculation git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/branches/WTI-867@5549 5a3db67b-de53-47b5-99c8-a1c30a6650e2