Subster 0.1.8

• Much more accurate release years: a song is dated by its first official release, so a bootleg or promo pressing no longer makes a card years too old • Servers that never expose MusicBrainz IDs — Nextcloud Music always — now use the album to identify the recording, fixing wrong years and missing songs • A song whose year can't be established is left out rather than dealt with a wrong one • Failed MusicBrainz requests are retried; a slow Wikidata lookup no longer holds up the deck