Add support for specifying tags during "notmuch new"

[David Bremner]

Austin Clements <amdragon at MIT.EDU> writes:

> What happens when this script dies in the middle (say, your computer
> loses power or notmuch tag conflicts with something else on the write
> lock)?  One advantage of the standard "new" tag approach is that it's
> easy to write a stateless post-new tagging script that can be killed
> at any point and restarted.  (You're right that post-new has a
> concurrency issue, but we should fix that in its own right.)

Hi David, Hi Austin;

So, what to do about this patch series? Is it actually a bad idea to
allow specifying tags for notmuch new? We already allow it via config,
right, so this just makes things more convenient.

d