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Coverage can be activated with given profile, aka mvn clean package -Pcoverage.
This leads to other changes, to improve code coverage.
In particular, Mtrie and Trie are now with 87 and 92% coverage.
Method signatures have also been changed to avoid extra copy of array when dispatching message from XPUB and XSUB.
Final changes: org.zeromq.ZMQ constants are referring to zmq ones, and handy constants for messages to controlled proxy were introduced.