title: Mercurial, ask for the password only once
body: <p>My problem is the next one:
  I work with several remote repos with Mercurial.
  Every time I want to pull and update from the remote repos I write</p>
  
  <pre><code>hg pull -u
  </code></pre>
  
  <p>Once I introduce this command, I am asked for the password for every repo.
  Is there a way to automate this behaviour in order to enter the password only once?</p>