* 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
* ignore some return codes when closing zip files and do not report them
* hide mostly useless debug message
* clear basic authentication cache after deletion of users and after updating them
otherwise deleted/changed users can still access the database!
* adjust wording
* added notes about mmfiles-specific parameters
* updated CHANGELOG and documentation
Jan
Simon Grätzer
Frank Celler