title: Updating Commit Message in Mercurial MQ extension
body: <p>After using <code>hg qnew</code> and <code>hg qrefresh</code> to create and update a patch that I want to apply to my repository, but the commit message that I wrote when I did <code>hg qnew</code> was not very good, it did not reference the ticket number from trac, and I would like to say something in it about some of the issues that my commit addresses.</p>
  
  <p>How do I do something like <code>hg qrewritemycommitmessage</code>. I have examined the <a href="http://mercurial.selenic.com/wiki/MqExtension" rel="nofollow noreferrer">docs on the website</a> and I have come up blank.</p>