Implemented beginning of calculation service for dune erosion. Related to Issue [WTI-777]git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@7489 5a3db67b-de53-47b5-99c8-a1c30a6650e2Former-commit-id: 019d8411c56301f5ad10e45d0de5dba6e8e4d9a4Former-commit-id: 038b5711e01828c63e78d65118adeb9d78b7af44