* added check for empty scheduler
* removed log, old is 1 not 0
* require running in this thread
* test
* added isDirect to callback
* signature fixed
* added drain
* added allowDirectHandling
* disabled for testing
* Add ExecContextScope object to direct call.
* try alternate initialization of ExecContextScope
* remove ExecContextScope, no help. try _fifoSize as part of direct decision.
* strand management to minimize reuse of same strand per listen socket
* blind attempt to address Jenkins shutdown lock up. may remove quickly.
* add filename and line to existing error log message
* Adjust queueOperation() to stop accepting items once isStopping() becomes true.
* revert previous check-in to MMFilesCollectorThread.cpp
* big reformat
* fixed merge conflicts
* Add CHANGELOG entry.
* Added cleanup functions class that allows to execute functions on unexpected shutdown (like FATAL_EXIT). First use: delete the LOCK file. (#5218)
* Removed superfluous log message
* return different error codes for check-version
* Adds data file for exit codes that can be used by ArangoDB applications
* add some exit codes
* better return codes for centos
* add codes in arangod
* remove test code
* prevent re-downloading of starter and other small improvements
* fix some erros
* finish centos
* update urls
* add info about systemd detection
* move further towards a working systemd setup
* set service type to simple
* add arangodb-update-db script
* start work on debian packages
* a db dir that is already in place (former installation) should be reused now
* fix minor bugs
* Implement exit code translation in the windows installer.
* add autogenerated NSIS exit code mapping