title: Moving complete rows in a QTableView
body: <p>I have a tab which contains a <code>QtableView</code> and few buttons like "MOVE UP" and "MOVE DOWN". So on "MOVE UP" button press I have to move the entire row of <code>QTableView</code> one step up and the bring the adjacent one, one step down. I want to achieve this without creating complete model again since it may take time to construct the whole model again. Instead I just want to MOVE UP the selected row in the view.
  Please let me know the simplest way to achieve this.</p>
  
  <p>Thanks in advance</p>