* Implemented review suggestions from WTI-Review-70: ** Refactored DesignVariable to have a constructor that takes a Distribution and Distribution property throws an exception when set to null. * Moved strings to resources. Related to Issue [WTI-33] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@689 5a3db67b-de53-47b5-99c8-a1c30a6650e2