[MERGE] Repository.iter_files_bytes()

[John Arbash Meinel]

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This changes iter_files_bytes() to return a chunked string, which is
what the api was defined as in the first place. It then tracks down the
various places that expected it to be a plain string, and fixes them.

This wasn't very difficult to do, and it turns out to have a very large
performance impact for "bzr co" of large trees like Launchpad. I didn't
test it with XML trees, but for brisbane-core, it changes "bzr co" from
about 17s => 11s.

John
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