Bug 130492 Provide a method to serialize the report with library information.
Currently, when engine generate the report document file, the document does not contain any library information. That will cause many propblem on server side. Model should provide a method to serialize the report with library information to a stream so that the generated report document can contain all information that the report need.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
return (Module) element;
	}
	/**
	 * Implements to broadcast an event to all listeners of this design element.
	 * Implementations of sendEvent( ) call this to do the actual work of
	 * broadcasting.
	 * <p>
	 * Part of: Notification system.
	 * 
	 * @param ev
	 *            the event to send
	 */
	public final void broadcast( NotificationEvent ev )
	{
		if ( this instanceof Module || getContainer( ) != null )
			broadcast( ev, getRoot( ) );
	}
	/**
	 * Implements to broadcast an event to all listeners of this design element
	 * on a design tree. Note subclasses should override this method to change
	 * the behavior of broadcast method.
	 * 
	 * Part of: Notification system.
	 * 
	 * @param ev
	 *            the event to send
	 * @param module
	 *            the root node of the design tree.
	 */
	public void broadcast( NotificationEvent ev, Module module )