[BUNDLE] Allow different diff output

[Szilveszter Farkas]

hi,

this is my first change to the bzr.dev codebase, maybe i did some
things wrong. please correct me :)

i attached a bundle which makes a trivial change: it allows the diff
output to be sent to other (file)streams than sys.stdout.

this little modification makes my life easier regarding the gui development :)

regards,
szilveszter / phanatic
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