title: Start tracking branches/tags on a git-svn repo that was tracking only trunk
body: <p>I've started tracking an svn repository with git by cloning only its trunk directory. Now I want to track the other stuff, but I don't want to have to clone it again just to use <code>--stdlayout</code> since it takes a long time to download and I already have most of the code locally. How do I change the repository layout to match svn trunk/branches/tags scheme without having to clone again?</p>