Tagging strategy and latest notmuch

[Austin Clements]

Quoth myself on Dec 28 at  8:26 pm:
> One thing that may help a bit is that, as of 0.10, notmuch tag has
> been optimized so, for example "notmuch tag -new '*'" is efficient.

Oops, this is also slated for 0.11.  It wasn't in 0.10.