Previously, IMAP was preferred over notmuch, even if notmuch was
configured, causing problems with setting account flavor (which
automatically sets IMAP settings). The new backend order is:
notmuch > IMAP > maildir
This also fixes the notmuch DB path being set to the wrong location.
The notmuch DB is located at the maildir base path, not in each
account's maildir.
* himalaya: add soywod to maintainers
* himalaya: make the config safer
Also added two services and more tests.
* himalaya: fix doc + typos
* himalaya: use freeform
* himalaya: run ./format
* himalaya: make use of mkPackageOption
