title: jqPlot show percent and value on pie chart
body: <p>I'm using jqPlot with jqplot.PieRenderer to try and display a pie chart. On the label I'd like to show <code>value (percent)</code>. The documentation says you can pass <code>dataLabel</code> an array of label types <a href="http://www.jqplot.com/docs/files/plugins/jqplot-pieRenderer-js.html#$.jqplot.PieRenderer.dataLabels" rel="noreferrer">(source)</a>, however, putting <code>%d%%</code> (for percent) and <code>%d</code> (for value) in the <code>dataLabelFormatString</code> option end up showing nothing.</p>
  
  <p>Any ideas here?</p>
  
  <pre><code>{ 
      seriesDefaults: {
          renderer: jQuery.jqplot.PieRenderer, 
          rendererOptions: {
              showDataLabels: true,
              dataLabels: ['value', 'percent'],
              dataLabelFormatString: "%d %d%%",
              sliceMargin: 4,
              fill: false
          }
      }, 
      legend: { show:true, location: 'e' }
  }
  </code></pre>