Added new board VR Brain 5.2: detection, driver and upload firmware
Firmware.cs: Added VRBRAIN 5.2 and corrected conflicts after rebase.
DistanceBar: add trial
Merge branch 'master' of https://github.com/diydrones/MissionPlanner.git
Merge pull request #749 from virtualrobotix/for_merge

Added new board VR Brain 5.2: detection, driver and upload firmware