VRBRAIN: modified target clean
AP_HAL: added missing CONFIG_HAL_BOARD_SUBTYPE #define for HAL_BOARD_VRBRAIN
AP_HAL_VRBRAIN: added management for external relay 1 and 2
AP_relay: added default relay pin for VRBRAIN
VRBRAIN: added startup of internal mag's driver for VR Brain Standard 5
AP_HAL: VRBRAIN corrected EEPROM size and added terrain folder on MicroSD
AP_HAL_VRBRAIN: enable 2nd GPS for VRBRAIN 5
DataFlash: Added four more channels for logging
Copter: enable mount control with channels > 8 for radios with SBUS.