[MERGE] Port across errors for shallow branch support.

[Aaron Bentley]

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Robert Collins wrote:
> Ah. Well I've come to the conclusion that branch stacking is the most
> scalable because all the other options seem likely to access many
> spurious locations far too often.

I don't feel good about reviewing errors for branch stacking when I
think branch stacking doesn't make sense.

If remote stacking locations are stored on a per-branch basis, then you
can easily wind up in situations where a branch can't access the
information it needs to construct the revision it wants.

Your post doesn't really clarify your reasoning to me, so I still think
branch stacking is a bad idea.

Aaron
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