title: Create SVN patch after commit
body: <p>Is it possible to retrospectively create a patch?  The Tortoise SVN client we are using gives us the option to create a patch instead of (or during) a commit.  </p>
  
  <p>I would like to work on the fix using the trunk, check it in and have the build server run all its tests and metrics to confirm that the fix is acceptable.  I would then like to be able to select a few revisions (if the first attempt at fixing it only got us part way there) and create a patch file from the files that have changed.</p>
  
  <p>I can then take the patch and apply it to a few other branches.  Is this possible?</p>