Bug 192789 Support to render reportlet using bookmark in frameset servlet.
Description: Support to render reportlet using bookmark in frameset servlet. At present, only run and preview servlet support __isreportlet&__bookmark to generate reportlet.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
servletPath = request.getServletPath( );
		IRunAndRenderTask runAndRenderTask = engine
				.createRunAndRenderTask( runnable );
		runAndRenderTask.setLocale( locale );
		if ( parameters != null )
		{
			runAndRenderTask.setParameterValues( parameters );
		}
		
		if ( displayTexts != null )
		{
			Iterator keys = displayTexts.keySet( ).iterator( );
			while ( keys.hasNext( ) )
			{
				String paramName = DataUtil.getString( keys.next( ) );
				String displayText = DataUtil.getString( displayTexts
						.get( paramName ) );
				runAndRenderTask.setParameterDisplayText( paramName,
						displayText );
			}
		}
		
		Map context = BirtUtility.getAppContext( request,
				ReportEngineService.class.getClassLoader( ) );
		runAndRenderTask.setAppContext( context );
		
		if ( renderOption == null )
		{
			if ( IBirtConstants.PDF_RENDER_FORMAT.equalsIgnoreCase( format )
					|| IBirtConstants.POSTSCRIPT_RENDER_FORMAT