.hgignore: add vendor tree composer.json: new packages plugins/thunderbird_labels/thunderbird_labels.php: change hook and RFC822 use wrt whitelisting to avoid deprecated stuff index.php: commented debugging hooks others: new releases of vendor packages?

-- Updates from version 0.8

ALTER TABLE cache DROP COLUMN cache_id;
DROP SEQUENCE cache_ids;

ALTER TABLE users DROP COLUMN alias;
CREATE INDEX identities_email_idx ON identities (email, del);