Forbid copying and assignment in layout classes.

Specifically in:
 * BAbstractLayout
 * BAbstractLayoutItem
 * BGridLayout
 * BGridView
 * BGroupLayout
 * BGroupView
 * BLayout
 * BSplitView
 * BTwoDimensionalLayout

headers/os/interface/GridLayout.h

@@ -111,6 +111,10 @@ private:
 	virtual	void				_ReservedGridLayout9();
 	virtual	void				_ReservedGridLayout10();
 
+	// forbidden methods
+								BGridLayout(const BGridLayout&);
+			void				operator =(const BGridLayout&);
+
 			BLayoutItem***		fGrid;
 			int32				fColumnCount;
 			int32				fRowCount;