requesting review by a team should send mail to the team members

As a patch author, i want the bzr windows developers (~bzr-windows) to review my patch and tell me if they see any issues, so i can avoid committing something that breaks win32. They're not subscribed to any branches by default.

When the user clicks "request a review" I think they can reasonably expect that this will actually request a view from the other party. This means the members of the requested team should be notified that a review is wanted.

See also bug 281056, about teams not getting reviews by default for branches they own. But it's a different case: that's about subscriptions whereas this is about review requests.

There is a possible risk of accidental or malicious spam by randomly subscribing large teams to noisy reviews, but that's already possible with bugs and doesn't(?) seem to be a large problem in practice.