title: Remove mercurial message "obsolete feature not enabled but xxx markers found"
body: <p>For a short time I had the <a href="https://www.mercurial-scm.org/wiki/EvolveExtension" rel="noreferrer">evolve extension</a> enabled in our Mercurial repository. Then I disabled it.</p>
  
  <p>Now I frequently see messages like:</p>
  
  <blockquote>
    <p>obsolete feature not enabled but 184 markers found!</p>
  </blockquote>
  
  <p>when various hg commands are run.</p>
  
  <p>How can I get rid of this message? I gather there are "obsolecense markers" in the repository now, is it possible to remove them and/or silence these messages?</p>