title: svndumpfilter - unsupported dumpfile version
body: <p>I', trying to migrate a part of my SVN repository to new location. I dumped the whole repository and now try to filter out my folder of interest:</p>
  
  <pre><code>$ svndumpfilter include sandwiches &lt; dumpfile &gt; filtered-dumpfile
  </code></pre>
  
  <p>But then I got following error:</p>
  
  <pre><code>svndumpfilter: unsuported dump file version: 3
  </code></pre>
  
  <p>I came across <a href="http://creatingwithcode.com/howto/extracting-projects-from-shared-svn/" rel="nofollow">quite old article</a> saying dump filter is not working if repository dump was created with <code>--deltas</code> flag.</p>
  
  <p><strong>Question:</strong> Is there any possibility to use <code>svndumpfilter</code> with dump file with deltas?</p>