title: SVN: Must be ancestrally related
body: <p>I am getting the error message above when I use the second SVN merge option i.e. "Reintegrate a branch/automatic merge".  I understand why I get the error i.e. it is because when creating the branch I simply dragged and dropped the project into a new branch from the Trunk (using Repo-Browser) instead of one of the following techniques:</p>
  
  <ol>
  <li>Use Copy To option in Repo-Browser</li>
  <li>Use Branch/Tag option (right click on project in Windows Explorer and select TortoiseSVN/Branch/Tag)</li>
  </ol>
  
  <p>I have three questions:</p>
  
  <ol>
  <li>Why do the projects have to be ancestrally related? This question suggests that SVN simply does a file comparison if this option is selected: <a href="https://stackoverflow.com/questions/6575325/svn-merge-a-range-of-revisions-vs-reintegrate">What are the differences between merging a range of revisions vs. reintegrate in SVN?</a>.</li>
  <li>Do both options above make the project ancestrally related?</li>
  <li>Does a simple drag and drop of the project from Trunk to Branch make the project none ancestrally related?</li>
  </ol>