[RFC] An explicit "this branch has moved" format

[Aaron Bentley]

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John Arbash Meinel wrote:
> So I was thinking about adding an explicit branch format, which when opened
> would tell the user that "you can find the real branch over here, I'll
> redirect
> you". Otherwise it would work like our current BranchReference format. (the
> format behind co --lightweight.)

It seems like a reasonable idea generally.  We might even use it on
Launchpad when users rename branches.

If this is meant to indicate a permanent move, should Bazaar update
references to the new location?

> And then we would add a command to create these. Maybe something like "bzr
> create-redirect-branch". (bzr init --format=redirect-branch? Doesn't
> quite work
> because you can't tell it the URL to redirect to.)

For my branch-stacking-policy work, I also need a way to create a
special control directory.  That control directory sets a default
stacking location.  Perhaps we could combine these into a meta-command.

$ bzr init-control --redirect LOCATION
$ bzr init-control --stacking-default LOCATION
$ bzr init-control --create-trees

Or since it could be used to adjust these values after they had been
set, perhaps "set-control" would be a better name.

Aaron
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