Update /usr/src with subversion

[Warren Block]

On Mon, 5 Aug 2013, David Noel wrote:

> Ok great, thanks Matthew. I tried a different search query and
> actually found a similar question on the forums:
> http://forums.freebsd.org/showthread.php?t=35014

That is an outdated thread.  Ignore it.

> Your solution looks a bit cleaner than the one proposed there: "rm -r
> /usr/src/.svn, and then check out the new branch".
>
> I'll check out the man for svn switch.

The new form is just 'svn relocate':
http://forums.freebsd.org/showpost.php?p=224243&postcount=5