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

[Aaron Bentley]

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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).

Aaron
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