- added in special handling for monitoring controlDict.

  Since controlDict is an unwatchedIOdictionary (not IOdictionary) and
  not registered either, the usual objectRegistry caching is not
  available. Instead, access directly from Time.

  Left the balance of the file handling largely intact (for handling
  unregistered dictionaries) but could potentially revisit in the
  future and attempt master-only file access if required. However,
  most other IOdictionary types will be registered, otherwise the
  READ_IF_MODIFIED mechanism would not really work properly.