title: Remove unknown files in Bazaar
body: <p>I have a bunch of unknown files in my Bazaar working tree that I no longer want.  I can get a list of them using <code>bzr stat</code>, but I'd like an easy way to get rid of them.  (I'd expect an option for <code>bzr revert</code> to do this, but I'm not finding one.)</p>
  
  <p>I can always write a tiny script to parse the output of <code>bzr stat</code> and <code>rm</code> or <code>mv</code> the unknowns, but I thought something might already exist.</p>
  
  <p>I have Bazaar (<code>bzr</code>) 1.13.1.</p>