Periodically send ACR_Candlekeep progress to server log.

- While background server resource loading is still under way,
  once per second, the server will pull down the content contents
  of the Archivist.debug string (exchanging it with an empty string
  so as to avoid output duplication or loss).  The string is sent
  to the server log file.

- Once loading is complete, an "ACR_Candlekeep: Resource loading
  complete." string is printed to the server log.
Additional fixes for ERF loading.