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
* Create PDF render option.
	 * 
	 * @param servletPath
	 * @param request
	 * @param isDesigner
	 * @return the PDF render option
	 */
	private PDFRenderOption createPDFRenderOption( String servletPath,
			HttpServletRequest request, boolean isDesigner )
	{
		String baseURL = null;
		
		if ( !isDesigner )
			baseURL = ParameterAccessor.getBaseURL( );
		if ( baseURL == null )
			baseURL = ""; 
		
		baseURL += this.contextPath;
		PDFRenderOption renderOption = new PDFRenderOption( );
		if ( servletPath != null && servletPath.length( ) > 0 )
		{
			renderOption.setBaseURL( baseURL + servletPath );
		}
		else
		{
			renderOption.setBaseURL( baseURL + IBirtConstants.SERVLET_PATH_RUN );
		}
		renderOption.setSupportedImageFormats( "PNG;GIF;JPG;BMP" ); 
		
		renderOption.setOption( PDFRenderOption.FIT_TO_PAGE, new Boolean(