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 endContainer( IContainerArea container )
	{
		if ( !containerStack.isEmpty( ) )
		{
			containerStack.pop( );
		}
	}
	/**
	 * Creates a new page.
	 * 
	 * @param page
	 *            the PageArea specified from layout
	 */
	protected void newPage( IContainerArea page )
	{
		currentPageNum++;
		currentImageContents.clear( );
		if ( pageWidth <= 0 )
		{
			pageWidth = pptMeasure( page.getWidth( ) );
		}
		if ( pageHeight <= 0 )
		{
			pageHeight = pptMeasure( page.getHeight( ) );
		}
		try
		{
			pptOutput.write( "--___Actuate_Content_Boundary___\n".getBytes( ) ); 
			pptOutput.write( ( "Content-Location: file:/C:/___Actuate___/s" + currentPageNum + "\n" ).getBytes( ) );