title: jqGrid Searchbox "greater than" and "less than" are missing
body: <p>How can i have greater than or lesser than in the Searchbox?</p>
  
  <p>below is my search code:</p>
  
  <pre><code>{multipleSearch:true}
  </code></pre>
  
  <p>Searchbox is showing only this
  <img src="https://i.stack.imgur.com/g3kLq.png" alt="Searchbox"></p>
  
  <p>Is there a settings that i need to set for jgGrid to recognize the field date as Date? it appears that it was being read as text.</p>
  
  <p>below is my colModel for date</p>
  
  <pre><code>{name:'date', index:'date', width:90, editable:false, align:"center", editrules:{required:true}}
  </code></pre>