Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
*            target element
	 * @return <code>true</code> if the refresh action is successful.
	 *         <code>false</code> othersize.
	 * 
	 */
	public static boolean duplicateStructure( DesignElement source,
			DesignElement target )
	{
		assert source != null;
		assert target != null;
		assert source.getDefn( ) == target.getDefn( );
		if ( source.getDefn( ).getSlotCount( ) == 0 )
			return true;
		DesignElement cloned = null;
		try
		{
			cloned = (DesignElement) source.clone( );
		}
		catch ( CloneNotSupportedException e )
		{
			assert false;
			return false;
		}
		
		
		Iterator sourceIter = new ContentIterator( source );
		Iterator clonedIter = new ContentIterator( cloned );
		while ( clonedIter.hasNext( ) )
		{
			DesignElement virtualParent = (DesignElement) sourceIter.next( );