Gmailieer provides fast email-fetching and two-way tag synchronization
between notmuch and GMail.
* Reload local repository if local changes have been made during sync.
* Only allow one instance of gmi for each directory.
* Ignore 'voicemail'.
* Optionally disable progressbar with flag (-s) or when no installed tqdm
(better support for non-tty output).
* Increase batch size if several successful requests have been made.
* Bug fixes.