title: Redmine upgrade via svn not working
body: <p>I'm running Redmine 2.1.6 and trying to update (after backing everything up) to the latest (2.3.0 and 2.2.4 as of this writing) by simply <a href="http://www.redmine.org/projects/redmine/wiki/RedmineUpgrade" rel="nofollow">following the instructions here</a> and doing an <code>$ svn update</code>.  I've successfully done this in the past with no problems.  However, this time, the <code>$ svn update</code> is not pulling any new code.</p>
  
  <p>I can still do a fresh checkout of version 2.3 by doing</p>
  
  <pre><code>$ svn co http://svn.redmine.org/redmine/branches/2.3-stable redmine-2.3
  </code></pre>
  
  <p>and this works, but the update from the existing installation doesn't work.  Anyone have any clues why it's not pulling the new code?</p>