title: Change SVN commit message retroactively?
body: <p>I would like to re-write a big number of SVN commit messages to a different structure, e.g. prefix a category. From:</p>
  
  <p><code>"foo" now accepts "bar" format for connection string.</code></p>
  
  <p>I want</p>
  
  <p><code>core - database - "foo" now accepts "bar" format for connection string.</code></p>
  
  <p>Is there an easy way to do this that does <em>not</em> include dumping the whole repository using <code>svndumpfilter</code>?</p>
  
  <p>I am working with TortoiseSVN on the client end, and VisualSVN on the server end. (VisualSVN is a wrapper around classic <code>svn</code>, which I can talk to through the command line as well.)</p>