Stabilization to 3.2 for simulation run.
Merge changes from master to 3.2 for fixing of the static/non-static for SITL class.
Added MavProxy listen port end() event on SIGTERM.  If you don't do this, sometimes the bind will fail because the listen is still in TIME_WAIT.
Merge in puppet from master.
Merge in incremental build changes to mk/build.sh
Merge in ZMQ change to SITL communications.
Unthrottles SITL packets (no more sleep in send to keep sensor data flowing as fast as possible).