Incorporated comments review 1468: - First refactoring of the derived classes from the ObservableCollectionWithSourcePath: -- Renamed class that it represents a collection with unique items -- Extracted method to get unique features from an object Related to Issue [WTI-1075] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@8315 5a3db67b-de53-47b5-99c8-a1c30a6650e2