title: svn: copy branch to trunk
body: <p>I have an SVN project with a branch I'm working on, and an empty trunk:</p>
  
  <pre><code>myproject/
    branches/
      mybranch/
        {there's stuff here}
    tags/
    trunk/
  </code></pre>
  
  <p>How can I copy the contents of mybranch into the trunk? TortoiseSVN complains that there's already a trunk directory. I could delete the (empty) trunk from the repository and then do a copy, but that seems wrong somehow...</p>
  
  <hr>
  
  <p><strong>clarification:</strong> I have a trunk which I intentionally left empty. My "mybranch" is all checked in. In the repo-browser, TortoiseSVN gives me a "copy" option but not a merge option.</p>
  
  <p>If  merging is the right thing to do, what do I do? Do I check out the empty trunk and then merge into that working copy, then check back in?</p>
  
  <hr>
  
  <p><strong>update:</strong> Merge won't work either; SVN complains the two "branches" (<code>branches/mybranch</code> and <code>trunk</code>) are not ancestrally related.</p>