* Working draft: clean lost collections in supervision.
* Added early exit as in spec.
* Finished test. Fixed logging.
* Increase plan version when cleaning out a lost collection.
* Increase the current version rather than the plan version.
* Fixed test for 3.3
* let's not miss failedserver removal
* remove resetting of FailedServers in test code
* Only call abortRequestsToFailedServers at most every 3 seconds.
* Add logging for _earliestPackage in Agent.
* Really enforce the hidden option --server.maximal-threads if given.
* Switch off --log.force-direct in scripts/startStandAloneAgency.sh
* Lower the timeout for sending AppendEntriesRPC to 150s.
* Erase _earliestPackage when becoming a leader.
* Challenge leadership in agent main loop.
* Use steady_clock for _earliestPackage.
* Change _lastAcked and _leaderSince to steady_clock as well.
* time difference calculations based on old readSystemClock to steadyClockToDouble
* All system_clock transitioned to steady_clock in Agent. Remaining system_clock are user input / output or timestamps
* Inception system_clock to steady_clock
* 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)
* Switching from ttl to supervision based failover mechanism
* Allowing canceling of ongoing actions
* refactored asyncjobmanager
* refactoring some code
* adding read-only flag
* catching some exceptions to reduce log pollution, removing unnecessary code, removing tests for _changeMode
* fixing "createsANewDatabaseWithAnInvalidUser"
* auth = off does not longer make everyone superuser
* Fixing cluster_sync and maybe resilience
* 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
* added debugging methods
* try to fix invalid access in case of error
* remove unused members
* bugfixes and comments
* all agency fixes in
* merge bug
* partially unguarded Agent::lead fixed
* all agency fixes in
* added nrBlocked to thread startup eval
* added nrBlocked to thread startup eval
* recombination of cases in State::get
* some maps replaced with unordered_maps
* optimized maps some