[merge] make "bzr testament" work with unicode commit messages

[Marien Zwart]

Currently "bzr testament" explodes with a UnicodeDecodeError if you
committed something with a non-ascii character in the commit message.
I have a branch from bzr.dev available at
http://mzz.mine.nu/bzr/bzr.dev which fixes this, adds a tests, and
cleans up an unnecessary function.

I am pretty sure the effect of the fix is ok, since it makes the
function do what the docstring says it does. If the fix is not
thorough enough or should be done in a different way please let me
know.

-- 
Marien.
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