[plugin] binary sys.stdout/err on win32

[Aaron Bentley]

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John Arbash Meinel wrote:
> This turns it on a little bit later than I would like, but I think it is
> a reasonable compromise.
> My concern is that all the developers will turn it on, but because the
> default is off, we won't really be using it the way a new user would.

I'd like to force it on for "bundle".  I'm not sure whether bundles will
display reasonably in console windows, though.

I'm not entirely comfortable with reusing "exact" to indicate "binary".
 It reminds me of the old Transport UI where 'rb' produced a bytstring
file and 'r' produced a Unicode file.

Perhaps 'exact-binary' makes sense.  Or maybe just making bundles
indicate newline type.

> As far as Martin's suggestion to also do sys.stdin. I would consider it
> if bzr actually ever read from stdin.

I think it's reasonable to support '-' for reading bundles from stdin.

Aaron
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