mod_storage_xmlarchive: Fix return of numeric 'when' from key-value API At some point, 'when' was stored as a timestamp string then as a numeric UNIX timestamp, so both cases needs to be handled, as they are elsewhere. Thanks spec/core_storagemanager_spec.lua

This module discards typing notifications sent to a bare host JID,
preventing error replies to be sent. These errors are harmless but can
be annoying sometimes if your client shows them prominently.