* 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
- migrate the process handling to c++ where appropriate
- move code definition / usage closer together
- add function to portably detect external processes (not spawned by us) and whether we may
- send them signals
- add portable code to send signals to processes
- for linux match what impact a signal will have on the process we send it
- check the status of the process we sent the signal, and return if its non-deadly or the process terminated
- after 8 retries with 1 second sleep send a hard kill.
- killExternal() now returns the same structure as statusExternal()
- don't block signals on spawned processes
* If our arango-object claims its got a connection to the arangodb server, use it to send a shutdown signal to the server.
If not, fall back to using a download http request.
* don't use kill to shut down the server, we now can use the regular shutdown command.
* do not use V8 variant of AQL functions in early optimization stage when a C++ variant is available
* additionally, simplify AQL function definitions and aliases
* warn when more than 90% of max mappings are in use
* added C++ variant of replication catchup
* added `--log.role` option
* updated CHANGELOG
* removed non-existing scheduler.threads option from config
* removed useless __FILE__, __LINE__ invocations
* updated CHANGELOG
* allow a priority V8 context
* remove TRI_CORE_MEM_ZONE
* try to fix Windows errors & warnings
* cleanup
* removed memory zones altogether
* exclude system collections from collection tests