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( REPORT_FILE );
					pptOutput = new FileOutputStream( file );
				}
				catch ( FileNotFoundException e )
				{
					logger.log( Level.SEVERE, e.getMessage( ), e );
				}
			}
		}
	}
	/**
	 * Creates a PPT Document.
	 * 
	 * @param rc
	 *            the report content
	 */
	public void start( IReportContent rc )
	{
		report = rc;
		if ( !imageNames.isEmpty( ) )
		{
			imageNames.clear( );
		}
		if ( !fileNamesLists.isEmpty( ) )
		{
			fileNamesLists.clear( );
		}
		try
		{
			pptOutput.write( "MIME-Version: 1.0\n".getBytes( ) );