[MERGE] Patience diff

[Aaron Bentley]

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I've now coded up a torture test for patience diff.  It opens a branch,
and walks through its repository, diffing each version against the last,
~ patching the result, and ensuring that the patched result is the same
as the target file.  The test passes with no issues.

I believe this addresses Martin's desire to test Patience thoroughly,
and if so, a merge request is in order.

For curiosity, I've also measured the size of patches.  I had expected
Patience to be much shorter, but that's not the case.  Patience is only
0.67% shorter on average (aggregate size of patience patches: 61643859,
aggregate size of difflib patches: 62059993).

My patience branch is at
http://code.aaronbentley.com/bzr/bzrrepo/others/bzr.patience/

Aaron
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