Have ics_archiver automatically respond to changes in ics_actorkeys.

The archiver has mechanisms for adapting to trivial schema evolution: addition of keyword tables, appending new columns to existing keyword tables.

But we are not dynamically reloading model dictionaries, nor do we have any logic for automatically detecting the actorkeys version in use system-wide, let alone detecting which actorkeys version a given actor is written for. The MHS keywords exist and are being generated, so this can be done.