Bug 199360 Provide new servlet to retrieve html fragment when in reportlet mode
Currently in reportlet mode, the framesset servlet will still wrap and return all ajax viewer code. We need a new servlet to return only html fragment generated by engine. Then this fragment can be further parsed by client side according to user's requirement.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
* @throws ReportServiceException
	 */
	protected Map getDefaultValues( IViewerReportDesignHandle design,
			Collection parameterList, HttpServletRequest request,
			InputOptions options ) throws ReportServiceException
	{
		Map map = new HashMap( );
		
		for ( Iterator iter = parameterList.iterator( ); iter.hasNext( ); )
		{
			ParameterDefinition parameter = (ParameterDefinition) iter.next( );
			if ( parameter == null )
				continue;
			String paramName = parameter.getName( );
			if ( paramName != null )
			{
				Object paramValue = this.getReportService( )
						.getParameterDefaultValue( design, paramName, options );
				map.put( paramName, paramValue );
			}
		}
		return map;
	}
	/**
	 * get parsed parameters as string.
	 * 
	 * @param parameterList
	 *            Collection
	 * @param request
	 *            HttpServletRequest