Bug 143173 No error for recursive including when exporting a report to a library
Steps to reproduce: 1.New a library named "Lib", add a lable in it 2.New a report, extends Lib.label 3.Export the report, choose target library "Lib" Expected result: Error to warn the recursive including Actual result: The target library includes itself without error
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
* before copy other property values. If the identifier is not set first,
	 * extension property definitions cannot be found. Hence, duplicating
	 * property values cannot be right.
	 * <p>
	 * The extension identifier is:
	 * <ul>
	 * <li>EXTENSION_ID_PROP for Oda elements.
	 * <li>EXTENSION_NAME_PROP for extension elements like chart.
	 * </ul>
	 * 
	 * @param source
	 *            handle of the source element
	 * @param destination
	 *            handle of the destination element
	 */
	private static void duplicateExtensionIdentifier(
			DesignElementHandle source, DesignElementHandle destination )
	{
		
		
		
		if ( source.getElement( ) instanceof IOdaExtendableElementModel )
		{
			String extensionId = (String) source
					.getProperty( IOdaExtendableElementModel.EXTENSION_ID_PROP );
			destination.getElement( ).setProperty(
					IOdaExtendableElementModel.EXTENSION_ID_PROP, extensionId );
		}
		else
		if ( source.getElement( ) instanceof IExtendedItemModel )