title: jqplot : tickOptions: {formatString: '%d'} shows duplicate intervals on x-axis
body: <p>I am plotting graphs using <strong>"jQplot" (jquery.jqplot.js and jquery.jqplot.css)</strong></p>
  
  <p>For this I have written following code:</p>
  
  <pre><code>$tfsGraphNodes= "[1,4],[2,2],[3,21],[4,61],[5,71],[6,10]";
  $.jqplot('chartdiv', [[{/literal}{$tfsGraphNodes}{literal}]],
                          {title: 'Applicant Behaviour'
                                      , series: [{color: 'green'},
                                  , {label: 'Applicant Trend'}]
                                      , legend: {show: true}
                              , highlighter: {showTooltip: true}
                              , axes: {
                                  xaxis: {
                                      tickOptions: {formatString: '%d'}
                                  },
                              }
                          });
  </code></pre>
  
  <p>To get integer value on x-axis I have used <code>tickOptions: {formatString: '%d'}</code> and I am getting the value as <strong>(0,1,1,2,2,3,3,4,4,.....)</strong></p>
  
  <p>But I want the interval not to be duplicated.</p>
  
  <p>For better understanding I am attaching the image:</p>
  
  <p><img src="https://i.stack.imgur.com/lOCCY.png" alt="enter image description here"></p>