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
{
				file = new File( fd.toString( ) );
				File parent = file.getParentFile( );
				if ( parent != null && !parent.exists( ) )
				{
					parent.mkdirs( );
				}
				pptOutput = new FileOutputStream( file );
			}
		}
		catch ( FileNotFoundException fnfe )
		{
			logger.log( Level.WARNING, fnfe.getMessage( ), fnfe );
		}
		
		
		
		if ( pptOutput == null )
		{
			Object value = services.getOption( RenderOption.OUTPUT_STREAM );
			if ( value instanceof OutputStream )
			{
				pptOutput = (OutputStream) value;
			}
			
			
			else
			{
				try
				{