Autocrypt support

[Ralph Seichter]

* Daniel Kahn Gillmor:

> [...] if you'd like to help me strategize about next steps for getting
> autocrypt support into notmuch itself, i'd welcome the collaboration.

I'd be willing to help if you think I can actually be of use to you. ;-)
I have, as of today, not even looked at the Notmuch architecture and
source code. I do know a reasonable amount about GnuPG, RFC 5322 et al,
though.

-Ralph