title: Issue with installing Mercurial Activity extension
body: <p>I'm using Windows XP with installed Mercurial TortoiseHg on it. Now I need to install the external <a href="https://www.mercurial-scm.org/wiki/ActivityExtension" rel="nofollow noreferrer">activity extension</a>. I downloaded the extension and enabled it in hgrc.</p>
  
  <p>When I'm try to call it using command:</p>
  
  <pre><code>hg activity
  </code></pre>
  
  <p>I receive the following error:</p>
  
  <pre><code>There are 292 changesets
  Hg activity options: you need matplotlib in your python path in order to use the hg activity extension.
  </code></pre>
  
  <p>Then I installed the python 2.6 and matplotlib. So the paths of them are: </p>
  
  <ul>
  <li>D:\Python26\</li>
  <li>D:\Python26\Lib\site-packages\matplotlib</li>
  </ul>
  
  <p>Now I don't know how to tell mercurial activity extension to use matplotlib from that location? I found some explanation in the <a href="http://tortoisehg.bitbucket.io/manual/0.9/faq.html" rel="nofollow noreferrer">TortoiseHg FAQ</a>, under the heading "Where do TortoiseHg extensions look for external Python modules on Windows?"</p>
  
  <p>But when I do the steps that are written there I receive the same error message as above.</p>