Set default suffix (#2230)

include/VersionedSaveDialog.h

@@ -44,6 +44,7 @@ public:
 
 	// Returns true if file name was changed, returns false if it wasn't
 	static bool changeFileNameVersion( QString &fileName, bool increment );
+	static bool fileExistsQuery( QString FileName, QString WindowTitle );
 
 public slots:
 	void incrementVersion();