Implement validation in the data model, add tests to data model and started adding tests to calculator services. Old tests have been adapted to create valid generalresult/faulttrees so they won't throw exceptions when creating them. Related to Issue [WTI-1391] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@11925 5a3db67b-de53-47b5-99c8-a1c30a6650e2