Add general distance sensor message
Fix message packing issues that prevent the checksum from being properly added to the packet
force all structs to be packed
Corrected XML for new MAV_DISTANCE_SENSOR message
Merge pull request #197 from Susurrus/distance

Corrected XML for new MAV_DISTANCE_SENSOR message
Merge pull request #195 from mavlink/packed_structs

Force all structs to be packed
Document custom mode field
pymavlink: support .log files in mavmission.py
ardupilot: merge camera messages from Andrew Chapman
Added MAV_CMD_DO_RALLY_LAND for rally landings
Added MAV_CMD_DO_GO_AROUND to abort rally landings safely.