[RFC] Refactor diffing

[Aaron Bentley]

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Here's an updated version.  A couple of things:
1. several parts of Bazaar treat binary file handling as part of the
text diff protocol, so having a separate BinaryFileDiffer breaks
compatibility, and doesn't seem like a great improvement.

2. I'm not sure the tri-value return
(unchanged/changed/could-not-handle) makes sense.  We already know
whether the file is changed, and we wouldn't be diffing it if it was
unchanged.  So I think this could just be True for "could handle" and
False for "could not handle".

Thoughts?

Aaron


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