Add the "maildir-store" account configuration option to select the
maildir store to associate with the notmuch database.
This also allows the previous changes to be backward compatible since
not specifying this option will make the backend behave the same as if
there were no changes.
Fixes: https://todo.sr.ht/~rjarry/aerc/73
Signed-off-by: Julian Pidancet <julian.pidancet@oracle.com>
Acked-by: Robin Jarry <robin@jarry.cc>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>
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