Added Read and Create Extensions for the persistency of the foreshoreprofile folder location: - Added missing tests for the HeightStructuresCollectionSourcePath - Updated XMLDocs - Added missing tests in case there was no test present to verify behavior without foreshoreprofiles - Changed First() to Single() calls for the failure mechanism meta-entities when applicable in the CreateExtension tests: there should only be one meta-entity created for each failure mechanism Related to Issue [WTI-1112] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@9577 5a3db67b-de53-47b5-99c8-a1c30a6650e2