Make sure the ensemble file sets are relocated

Use similar logic as relocation of caf::FilePath. Not possible to reuse code, as RimTools::relocateFile checks if the candidate file is present on the file system.

ApplicationLibCode/ProjectDataModel/EnsembleFileSet/RimEnsembleFileSetCollection.h

@@ -41,6 +41,8 @@ public:
     void                             deleteAllFileSets();
     void                             deleteFileSetIfPossible( RimEnsembleFileSet* fileSet );
 
+    void updateFilePathsFromProjectPath( const QString& newProjectPath, const QString& oldProjectPath );
+
     QList<caf::PdmOptionItemInfo> ensembleFileSetOptions() const;
 
     void updateFileSetNames();