title: Sort series per category
body: <p>I have a chart that looks like this:
  <a href="http://jsfiddle.net/rtGFm/37/" rel="nofollow">http://jsfiddle.net/rtGFm/37/</a></p>
  
  <p>I would like to have a "sort" button that sorts high to low each category, putting the columns in a different order for each category.  Is this possible with HighCharts?</p>
  
  <pre class="lang-js prettyprint-override"><code>var chart;
  $(document).ready(function() {
      chart = new Highcharts.Chart({
          chart: {
              renderTo: 'container',
              type: 'column'
          },
          title: {
              text: ''
          },
          subtitle: {
              text: ''
          },
          xAxis: {
              categories: [
                  'foreclosures',
                  'nuisances',
                  'distance from city center'
              ]
          },
          yAxis: {
              min: 0,
              title: {
                  text: ''
              }
          },
          tooltip: {
              formatter: function() {
                  return ''+
                      this.x +': '+ this.y +' mm';
              }
          },
          plotOptions: {
              column: {
                  pointPadding: 0.2,
                  borderWidth: 0
              }
          },
          series: [{
              name: 'Alger Heights',
              data: [49.9, 71.5, 50]
          }, {
              name: 'Shawmut Hills',
              data: [83.6, 78.8, 67]
          }, {
              name: 'Baxter',
              data: [48.9, 38.8, 100]
          }, {
              name: 'Midtown',
              data: [42.4, 33.2, 80]
          }, {
              type: 'scatter',
              data: [55,60,70],
              marker: {
                  symbol: 'square',
                  lineColor: '#FFFFFF',
                  lineWidth: 1,
                  radius: 8
              },
              name: 'Average'
          }]
      });
  });
  </code></pre>