Added HydraulicDatabaseHelper with method to verify the currently set HRD path. Added verification of the HRD path before design water level calculations are added as activities. Refactored HydraulicBoundaryDatabaseImporter so that a separate ValidateAndConnectTo call is no longer necessary. Related to Issue [WTI-329] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@2869 5a3db67b-de53-47b5-99c8-a1c30a6650e2