title: how to change delete icon in jqgrid toolbar and in actions column
body: <p>I tried to replace jqgrid default delete icon in toolbar and in actions column with minus sign using</p>
  
  <pre><code>        $.extend($.jgrid.del, {
              delicon: 'ui-icon-minusthick'
  }
  );
  </code></pre>
  
  <p>but default icon (trash is still shown). How to replace it with minus sign ?</p>