title: QDockWidget Tab Position
body: <p>When I group multiple QDockWidgets in the same place, their tabs go at the bottom.  Is there a way to put them at the top?</p>
  
  <p>Even better is if I can replace the title bar with the tabs themselves.  the Eclipse IDE has very similar behavior, as can be seen in this screenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/8ZRYE.png" alt="Eclipse Tabs">.</p>
  
  <p>For example, the JUnit tab is also it's header and can be dragged to dock it anywhere else.</p>