[RFC] upgrade ordering & UI

[Robert Collins]

On Fri, 2009-05-15 at 10:00 +1000, Ian Clatworthy wrote:
> 
> No, it recurses downwards from the shared-repo using
> repo.find_branches(). It then works out which ones are stacked vs
> otherwise.

This doesn't find stacked branches then :). We explicitly don't stack in
shared repos. We might, but even if we did it doesn't need to be handled
any differently to a regular branch in the same repo.

The key thing is to upgrade all the stacked-on branches last, and that
requires coordination between stacker and stackee.

-Rob
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