Query and high-level control with Coordinators

Because Sims and Groups store their information neatly in their state files, this data can be aggregated and queried. This allows whole selections of Containers to be manipulated without needing to hunt them down in the filesystem. The Coordinator object gives an interface for doing this. Sims and Groups that are associated with a given Coordinator will report changes to their state files as they are made, giving the Coordinator a thin copy of all Containers it is made aware of.

This feature is not yet implemented.