export notmuch_database_reopen

[Reto]

On 13 February 2020 23:54:48 CET, David Bremner <david at tethera.net> wrote:
>Do you have any measurements of time or memory savings?

No, but between not having to do a open/close cycle (including garbage collection on the go side) and having to do it, I expect it would be better if the DB can be reopened.

The suggestion that _notmuch_database_reopen might be sensible to export actually stems from olly on IRC