* properly initialize all properties
* use faster comparison
* properly detect and handle "method not allowed"
* code-style
* remove unused variable
* narrow variable scope
* handle non-existance of AuthenticationFeature
* remove dead code
* replace some C string handling with std::strings
* moved assertion to the correct place
* honor number of array members for IN operator
* slightly adjust error messages
* slighty adjust some error messages
* try to fix issue with lingering replication contexts on shutdown
* clean up heartbeat thread a little bit
* small fixes