title: hg convert from svn, need to pull branches from more than one place
body: <p>I have a few odd issues with a svn repository I'm trying to convert to hg. Our repository looks more or less like this.</p>
  
  <pre><code>proj_root  ___ trunk
         \  \___ tags
          \_____ branches __A
                     \   \__B
                      \_____Q __ C
                            \___ D
  </code></pre>
  
  <p>Ideally I could specify <code>--config convert.svn.branches=branches;branches/Q</code> or somesuch nonesense. (Q does not contain a branch in itself, just the two "sub branches".</p>
  
  <p>I just finished converting a repository in which Q only had one subdirectory, and the solution there was easy. <code>rename C/ .</code> in a --filemap option, but that fails rather dramatically for this case (the Q branch interleaves C and D).</p>
  
  <p>Ideally, I could simply ignore Q entirely in one pass, and then do a second conversion with the convert.svn.branches option set to branches/Q, but I cannot get the following syntax in the filemap to work:</p>
  
  <pre><code>exclude "Q C D"
  </code></pre>
  
  <p>nor</p>
  
  <pre><code>exclude "C D"
  </code></pre>
  
  <p>My hope was that excluding C and D would prevent any files from being imported on that branch, and since I have a specified filemap, the resulting empty commits would be removed. I can't get the exclude directive to exclude any directories, no matter the various syntax options I've tried.</p>
  
  <p>Edit: The end result I'd like to have is a mercurial repo with trunk as the normal tip, and named branches A, B, C and D... that silly Q thing can just go away during the conversion, if I can figure out how.</p>