title: How can one change the name of a tag?
body: <p>I have made a tag in mercurial:</p>
  <pre><code>hg tag release_123
  </code></pre>
  <p>Later on I found out that the name was wrong, it should be <code>release_124</code>. Is it possible to simply rename the tag or do I have to create a new one?</p>