* Fixed object assignment operator for agency's key value store
* Node's toJson is now actually toJson. getString should be used for string extractions
* adjust agency's documentation (clarify precondition)
* fixed a bug, where when servers failed, when also agency leadership changes
* redid entire design of checkDBServers/checkCoordinators.
* comparison in supervision must be between oldPersisted and newHealth
* UI stuff
* UI stuff
* FailedServer test needed adjustment
* Hopefully final round
* fixed supervision failure detection
* FailedServer tests back to origin devel
* oldNot documented among preconditions in Agency HTTP API docs
* changed only look for status updated
* non action line in api-cluster