* selfcheck: Perform version and preflight checks
* selfcheck: Fail commander check if no data received
* selfcheck: Print firmware version
* selfcheck: Create publishers and subscribers globally
* selfcheck.py: add note about firmware in gitbook
* selfcheck: Move firmware version checks to FCU checks
* selfcheck: Show commander warnings
* selfcheck: Remove prompt line from received mavlink message
* clever: Add pymavlink as a ROS dependency