Bug 154178 Support projectFolder in BIRT viewer
If the report supports projectFolder, the viewer also need to enhance for this feature.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
* @param servletPath
	 * 
	 * @return the PDF render context
	 */
	private PDFRenderContext createPDFrenderContext( String servletPath )
	{
		PDFRenderContext renderContext = new PDFRenderContext( );
		if ( servletPath != null && servletPath.length( ) > 0 )
		{
			renderContext.setBaseURL( this.contextPath + servletPath );
		}
		else
		{
			renderContext.setBaseURL( this.contextPath
					+ IBirtConstants.SERVLET_PATH_RUN );
		}
		renderContext.setSupportedImageFormats( "PNG;GIF;JPG;BMP" ); 
		return renderContext;
	}
	/**
	 * Run and render a report,
	 * 
	 * @param request
	 * 
	 * @param runnable
	 * @param outputStream
	 * @param format
	 * @param locale
	 * @param rtl
	 * @param parameters