[MERGE] Fix bug causing file deltas to be added to wrong versionedfile

[Aaron Bentley]

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Aaron Bentley wrote:
> Hi all,
> 
> There's a bug in the revision installation code for bundle format 4.  In
> some circumstances, this can cause texts to be written to the wrong
> versionedfile.
> 
> For this to happen:
> 1. A file must be present in a bundle, all of whose revisions are
> present in the target branch
> 2. There must be file versions after this file.
> 
> It's a pretty rare case.  Today is the first time I've stumbled on it.
> The chance for data corruption is essentially none-- the worst that can
> happen is that an unreferenced record will be written (if this record
> was referenced, but not present in the target branch, that would
> contradict rule 1).

Here's a clean patch.

Aaron
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