release plan for 0.17

[David Bremner]

Hi Gang;

It's been a while since we had a release. There are some ABI breaking
ideas around, but I think it makes sense to release and then forge
forward with those.

Since I'm moving at a pretty slow pace these days on notmuch (and
everything) I propose the following schedule:

            Feature freeze: November 8
            Hard freeze: November 22
            Release: November 28 (approximately)

Feel free to start tagging things as notmuch:0.17 in nmbug if you think
they can be squeezed in the next few weeks.

d