Updated storage for Q-variant related calculations: - Read and Create Extension methods and corresponding tests - The StorageSqLiteIntegrationTest to assert the newly added properties - WaveConditionsOutput: explicitly initialize the CalculationConvergence and removed the optional constructor parameters Related to Issue [WTI-897] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@6989 5a3db67b-de53-47b5-99c8-a1c30a6650e2