Branch URLs can easily be too wide for new layout

https://launchpad.net/people/kamion/+branch/anna/ubuntu shows, I think, a reasonably typical baz URL (although unrelatedly I think I must have got the syntax wrong since it doesn't seem to want to report any status on those branches); it overflows the new layout in an unpleasant way.

I suggest one of the following:

 * wrap the URL
 * use the usual HTML/CSS tricks to arrange for the URL to flow below the block on the right-hand side
 * don't display the full URL at all, instead just say something like Branch: <a href="branch-url">branch-name</a>