[MERGE/RFC][0.91?] separate word (dev/candidate) in version info with dots

[Alexander Belchenko]

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Aaron Bentley пишет:
> Aaron Bentley has voted comment.
> Status is now: Semi-approved
> Comment:
> I don't understand why this would help your utility.  If it uses the
> version,  it should use version_info.

Because for standalone bzr.exe I need to read output of `bzr --version`
and add path to bzrlib to sys.path. Otherwise I cannot import bzrlib at all.
And in latest releases (maybe in 0.90 too) format of version output
slightly changed. I'd like to keep my utility in state when it supports
multiple versions of bzr, except backward-incompatible changes.

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