[MERGE REVIEW] Merge against '.' works properly

[Aaron Bentley]

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Robert Collins wrote:
|>Fine with me, here's a patch that does that.
|>
|>Or see http://code.aaronbentley.com/bzr/bzrrepo/bzr.mergeself/
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| +1 if you can explain what the exception is being added for :)
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| I'm much better now, starting to catch up on the lists.

Fairy nuff.  I've removed the class and submitted.

Aaron
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