Fix mavlink log header docs.
Fix accel cal docs.
Documentation only and unused defines only cleanup.
Command handling: Fix up local variable usage and status prints.
Buzzer and led: Fix -Wshadow warnings.
Mavlink text feedback: Remove now unneeded audio tag for critical messages, make overall printing more efficient. Remove buffers where no buffers are needed.
commander status leds: Fix -Wshadow warning.
commander RC handling: Fix -Wshadow warnings.
commander: More docs-only changes in headers.
commander: more text feedback improvements.
commander: Final MAVLink text feedback cleanup
Merge pull request #1175 from PX4/warnings_cleanup

Warnings cleanup
Removed spurious submodule entry
Merge branch 'master' of github.com:PX4/Firmware
Merge branch 'master' of github.com:PX4/Firmware into min_alt