[MERGE] Comments and tests for repository stacking

[John Arbash Meinel]

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Martin Pool wrote:
> I investigated <https://bugs.launchpad.net/bzr/+bug/252428>.  It looks like the
> concern expressed there is not actually a real bug in the code as it stands,
> but it was worth checking.  This adds two (passing) tests for handling of
> repacking of stacking, and some comments to make it more clear why it is as it
> is.
> 
> I'm also going to add some integration-type tests for the scenario of upgrading
> a stacked-on repository.  You should then get an error trying to use the
> stacked repository, but it should be possible to upgrade that too and then keep
> going.
>

BB:approve
John
=:->

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