Copter: update AC3.2 ReleaseNotes
Copter: update version to AC3.2
VRBRAIN: modified target clean
AP_Compass: VRBRAIN. Deal with external mag connected on internal I2C on VRBRAIN 4.5
This enables user to set the external parameter to true even if only one compass is connected
VRBRAIN: defined AirSpeed inputs for ArduPlane on VR Micro Brain 5
VRBRAIN: added flag for to build versions with different kind of RC Inputs
VRBRAIN: added new board VR Brain 5 PRO
VRBRAIN: added script for build all VirtualRobotix binaries
AP_Compass: VRBRAIN add #if !defined() for VRBRAIN 4.5 boards.
Map CH6 to CH7