title: HG: Update a directory to a specific revision without cloning the whole repo?
body: <p>Is it possible to <code>update</code> a directory to a specific revision without cloning the whole repository (local or on a central server) in Mercurial and how can I use it? This would be great, because to <code>clone</code> the whole repo first takes to much time for me and the folder really don't needs the whole repo. As example: <em>default</em> and the <em>b2.3</em> branch from which I want to update.</p>
  
  <p>Thanks in advance! :)</p>