Forbid copying and assignment in layout classes.

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

headers/os/interface/GroupLayout.h

@@ -75,6 +75,10 @@ private:
 	virtual	void				_ReservedGroupLayout9();
 	virtual	void				_ReservedGroupLayout10();
 
+	// forbidden methods
+								BGroupLayout(const BGroupLayout&);
+			void				operator =(const BGroupLayout&);
+
 			struct ItemLayoutData;
 
 			ItemLayoutData*		_LayoutDataForItem(BLayoutItem* item) const;