[MERGE] Fix encoding of Already Versioned error

[Aaron Bentley]

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Martin Pool wrote:
> Martin Pool has voted +1 (conditional).
> Status is now: Conditionally approved
> Comment:
> hm, i would have thought exceptions should keep their message in unicode
> until they're printed out.  but if that's how it is, ok.

The other parameters to a BzrError are permitted to be unicode strings,
but the msg is required to be a bytestring.

I think BzrError ought to provide __unicode__ rather than __str__, but
it doesn't at present.

Aaron
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