SW-693: Do not depend C++ code on a pure-python package, as our CMake does not support that (well, LCS/Common does not)

SW-657: added test to prove that proton is not thread-safe. Running the PingPongTester results in eratic behaviour, either deadlocking, of crashing proton. Now let's find a solution!

SW-693: Swap ToBus/FromBus broker/options parameters to make overriding broker easier (common) than overriding options (uncommon)

SW-693: Swap ToBus/FromBus broker/options parameters to make overriding broker easier (common) than overriding options (uncommon)

SW-693: Remove dependency on PyCommon for dependees that want to generate Version headers (which cannot have any dependencies that are Python only).

SW-657: added connection error handling + auto reconnect. Limited the number of threads for the buslisteners because of proton multithreading issues

SW-657: Use scu001/199 directly for LCS/Messaging/python, to avoid relying on qpid infrastructure for our services.

SW-657: number of threads needs to be 1 because of the way we use proton, otherswise one thread can receive a message and another thread can ack it, and then mayhem starts

SW-657: added TODO to handle exception on sending to removed-temp-queue when an rpc client did timeout

SW-657: added todo about reconnect on proton._exceptions.ConnectionException, and assert on improper threads administration

SW-658: Revert QPIDWebMonitor to python2 as it still requires QPID, and updated start/stop scripts to work with the use of env in QPIDWebserverJSON

SW-658: needed to refactor parts of the FromBus/ToBus because connections were not released. Took the opportunity to factor out common behaviour into abstract super class.