title: jstree checkbox manipulation
body: <p>I have a jstree with checkbox for every nodes. I want to achieve the following. Let me know which method or part of api helps us to do that.</p>
  
  <ol>
  <li>I do not want to check any child nodes when parent node is selected. Currently all the children gets selected.</li>
  <li>If any child node is checked then check all its parent node. Currently parent nodes get partially checked (square). I want to remove partial selection completely. That is I want to completely alter behavior of jstree checkboxes.</li>
  </ol>
  
  <p>I searched API docs but found nothing.</p>