title: What is the method to set the text for a QTreeWidget's header?
body: <p>I've checked the documentation <a href="http://qt-project.org/doc/qt-4.8/qtreewidget.html" rel="noreferrer">here</a> and I can't seem to find a method for setting the text of a QTreeWidget's title or header. </p>
  
  <p>Without setting the title QTreeWidget automatically uses the number '1' in my code. An example of what it looks like outputted is below. I'm presuming QTreeWidget has a method for this and I just can't find it.</p>
  
  <p><img src="https://i.stack.imgur.com/vE7fi.png" alt="QTreeWidget example"></p>