[WIP PATCH 3/4] lib: API to retrieve database revision and UUID

[Gaute Hope]

Hi,

there's a typo in ..get_revision (revisison).

Cheers, Gaute

Excerpts from Austin Clements's message of October 13, 2014 8:20:
> +unsigned long
> +notmuch_database_get_revisison (notmuch_database_t *notmuch,