title: how to reorder columns in jqgrid by dragging column headers
body: <p>jqgrid doc in <a href="http://www.trirand.com/jqgridwiki/doku.php?id=wiki%3ajquery_ui_methods&amp;s%5B%5D=chooser" rel="nofollow">here</a> contains:</p>
  
  <p>method <strong>allow to reorder the grid columns using the mouse</strong>. The only necessary setting in this case is to set the sortable option in jqGrid to true.</p>
  
  <p>I have sortable: true but columns cannot reordered by dragging headers by mouse.  How to re-order columns by dragging columns headers or other way without using column chooser ?</p>