title: highchart stacked column, display extremely small values in shift lable
body: <p>i am currently using [highchart js lib][1]  to create a stacked column chart for my project. </p>
  
  <p>here is my exact code:</p>
  
  <pre><code>$(function () {
          $('#container').highcharts({
              yAxis: {
                  min: 0,
                  title: {
                      text: 'Total fruit consumption'
                  },
                  stackLabels: {
                      enabled: true,
                      style: {
                          fontWeight: 'bold',
                          color: (Highcharts.theme &amp;&amp; Highcharts.theme.textColor) || 'gray'
                      }
                  }
              },
              legend: {
                  align: 'right',
                  x: -70,
                  verticalAlign: 'top',
                  y: 20,
                  floating: true,
                  backgroundColor: (Highcharts.theme &amp;&amp; Highcharts.theme.background2) || 'white',
                  borderColor: '#CCC',
                  borderWidth: 1,
                  shadow: false
              },
              tooltip: {
                  formatter: function() {
                      return '&lt;b&gt;'+ this.x +'&lt;/b&gt;&lt;br/&gt;'+
                          this.series.name +': '+ this.y +'&lt;br/&gt;'+
                          'Total: '+ this.point.stackTotal;
                  }
              },
              plotOptions: {
                  column: {
                      stacking: 'normal',
                      dataLabels: {
                          enabled: true,
                          color: (Highcharts.theme &amp;&amp; Highcharts.theme.dataLabelsColor) || 'white',
                          style: {
                              textShadow: '0 0 3px black, 0 0 3px black'
                          }
                      }
                  }
              }
          });
      });
  </code></pre>
  
  <p>so the extremely small value shows up in extra label .</p>
  
  <p>i am not even sure highchart lib can do that or not,</p>
  
  <p>please suggest with some code example. cheers</p>