Stacked branches status update

[Ian Clatworthy]

Ian Clatworthy wrote:
> It's available
> from http://people.ubuntu.com/~ianc/bzr/shallow-branch/ for
> anyone who wants to test stacked branches.

> Today, I'm planning to make some tweaks based on Aaron's
> feedback. See https://lists.ubuntu.com/archives/bazaar/2008q2/040079.html.
> In particular:
> 
> 1. The storage of the stacked-on branch will be moved from
>    a custom file ('stacked-on') to an entry in branch.conf.
> 
> 2. The terminology used in options and error messages will be
>    changed from "shallow" to "stacked".

Done and pushed to the location above. Note that the API
has changed to use "stacked" instead of "shallow" as well.

Ian C.