Bug 194371 Use page emitter framework to implement ppt emitter.
In order to keep consistent with pdf and postscript, ppt need to use page emitter framework.
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
}
	public void visitContainer( IContainerArea container )
	{
		startContainer( container );
		Iterator iter = container.getChildren( );
		while ( iter.hasNext( ) )
		{
			IArea child = (IArea) iter.next( );
			child.accept( this );
		}
		endContainer( container );
	}
	/**
	 * If the container is a PageArea, this method creates a new page. If the
	 * container is the other containerAreas, such as TableArea, or just the
	 * border of textArea/imageArea this method draws the border and background
	 * of the given container.
	 * 
	 * @param container
	 *            the ContainerArea specified from layout
	 */
	public void startContainer( IContainerArea container )
	{
		if ( container instanceof PageArea )
		{