Extended StabilityPointStructuresCalculationConfigurationWriter and test Fixed StabilityPointStructuresCalculationConfiguration.ConfigurationInflowModelType is nullable and therefore, does not have a default value. Related to Issue [WTI-1165] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@9087 5a3db67b-de53-47b5-99c8-a1c30a6650e2