- jmaptest and opencloud_full: use Stalwart 0.16.27 and stalwart-cli 1.0.13
- use the BCP 47 locale "en-US" in the Stalwart configuration snapshots,
Stalwart rejects "en_US" since 0.16.20
- TestGroupwareVacation: Stalwart 0.16.27 keeps isEnabled when other
vacation properties change, expect true now
- TestWs: Stalwart may return a different but equivalent newState when
nothing changed, and announces new mail with EmailDelivery (since 0.16.16)