title: Highstocks Multiple x-axis or just remove date and use numbering
body: <p>I would like to use <code>multiple x axis</code> using HighStocks.</p>
  
  <p>I would like to compare the values from different date periods. </p>
  
  <p>If I am not able to use multiple x-axis I would like to use numbering for example convert all dates to points and use <code>1,2,3,4,...</code></p>
  
  <p>Thanks</p>