TreeService still needs some cleaning up since it also contains some test. These tests need to be move to a seperate test program.

Task #8531: Modified Service to allow code-insertion at 4 new places. Currently tested with 'pass' in those function to assure backward compatiblity.

Task #8571: Added comment for functions and fix corner case for messages being received from a previous timed-out rpc call. Also fixes a bug with using queues instead of a bus exchange.

Task #8571: Added option for receiving the full ServiceMessage by the service handler in Service.py and allow the service handler to return a ReplyMessage.

Task #8571: We can't pickle the backtrace and exceptions so only use the backtrace string when applicable. Also ForwardExceptions at the client tries to throw the same exception.

Task #8571: Initial import of messaging python libraries based on work from Marcel Loose for APERTIF.