Prototype stacking-policy implementation

[Aaron Bentley]

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Hi all,

Of course, it would be mean to hide the prototype stacking-policy
implementation.  It's not ready for review yet, but that's mainly
because stacked repositories haven't landed yet.

http://code.aaronbentley.com/bzr/bzrrepo/stacking-policy2/stacking-policy

(This also has a couple bugfixes to shallow branches to get all the
tests passing.)

Here's an example of how to get it going:
$ cd sandbox/
$ bzr branch ~/bzr/bzr.dev stack_on
Branched 3332 revision(s).

$ ~/bzr/stacking-policy2/bzr upgrade --development1 stack_on
...kipple...
$ bzr init policy
abentley at lappy:~/sandbox$ echo
default_stack_on=/home/abentley/sandbox/stack_on > policy/.bzr/control.conf
$ ~/bzr/stacking-policy2/bzr push -d stack_on/ policy/stacked
Created new branch.

$ ~/bzr/stacking-policy2/bzr info policy/stacked/
Standalone tree (format: development1)
Location:
  branch root: policy/stacked

Related branches:
  parent branch: /home/abentley/bzrrepo/others/bzr.dev
     stacked on: /home/abentley/sandbox/stack_on

Rather a lot of work, but at least it's now possible.

Aaron
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