[MERGE] Comments and tests for repository stacking

[Robert Collins]

On Fri, 2008-08-01 at 13:41 +1000, Martin Pool wrote:
> 
> +        *this* vfs; if there are fallbacks their index must be 
> +        queried separately.

Fallbacks are VersionedFiles, so we don't ever query their _index
directly; I would say

*this vfs; if there are fallbacks they must be queried separately.

bb:approve

-Rob
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