[PATCH 1/5] util: Factor out boolean term quoting routine

[David Bremner]

Austin Clements <amdragon at MIT.EDU> writes:
>
> This could live in tag-util as well, but it is really nothing specific
> to tags (although the conventions are specific to Xapian).
>
> Furthermore, this now combines the term prefix with the quoted term;
> arguably this is just as easy to do in the caller, but this will
> nicely parallel the boolean term parsing function to be introduced
> shortly.

At first glance, I found this a bit too notmuch-specific to go in
util. On second glance, I found my first reaction somewhat
bizarre. Perhaps at some point we should drop a README file in util
explaining what should go there.

Other than that, LGTM
d