introducing a twisted dependency

[Robert Collins]

With Transport finally landed - yay! - we can seriously move forward
with making our network support first class.

I propose that we use twisted - I did a proof of concept branch at
http://people.ubuntu.com/~robertc/baz2.0/twisted that shows how code
written using twisted might look. Doing this 'right' - making the core
of bzr event driven in nature is a pretty big change, but the benefits
are quite big too.

I'll happily forward port the -core- of that proof of concept to
newformat, though the smart fetch logic is way to disconnected from
newformat to be easy to port.

Cheers,
Rob

-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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