title: Highcharts data labels overlapping columns
body: <p>I have a problem with data labels overlapping columns in my chart.</p>
  
  <pre><code>$('#container').highcharts({
          chart: {
              type: 'column'
          },
  
          xAxis: {
              type: 'datetime'
          },
          series: [{
              data: [[Date.UTC(2013, 3, 1, 0, 0, 0), 169], 
                    [Date.UTC(2013, 4, 1, 0, 0, 0), 176], 
                    [Date.UTC(2013, 5, 1, 0, 0, 0), 470], 
                    [Date.UTC(2013, 6, 1, 0, 0, 0), 346], 
                    [Date.UTC(2013, 7, 1, 0, 0, 0), 252], 
                    [Date.UTC(2013, 8, 1, 0, 0, 0), 138]],
              dataLabels: {
                  enabled: true
              }
          }]
      });
  });
  </code></pre>
  
  <p>You can see an exmaple here: <a href="http://jsfiddle.net/J6WvR/1/" rel="noreferrer">http://jsfiddle.net/J6WvR/1/</a></p>
  
  <p>My chart should have fixed height and I don't understand why the largest column height cannot be calculated to fit its data label. How can I fix this?</p>