[arangod/GeneralServer/AuthenticationFeature.cpp:42]: (warning) Member variable 'AuthenticationFeature::_authenticationTimeout' is not initialized in the constructor.
[arangod/Utils/Authentication.h:49]: (performance) Function parameter 'roles' should be passed by reference.
[arangod/VocBase/AuthInfo.h:47]: (warning) Member variable 'AuthResult::_expiry' is not initialized in the constructor.
* extend linenoise character buffer size
* dont make it throw exceptions all the time
* set INSTANCE to nullptr at a later stage
otherwise a nullptr may be accessed during shutdown