[notmuch] A few patches

[Sebastian Spaeth]

> > to count everything. Anyone have a better option for what the
> > give-me-everything syntax should be?
> 
> notmuch count ''
> 
> The search patterns limit the matched messages/folders. An empty pattern
> should match everything.

I agree that '' should work, but then I would expect to have '*' work as
well. Is there a reason not to have both at the same time? Both make sense.

Sebastian