Pilot Flying identification by means of VHF usage removed, convention is:
* VHF 1/L is the primary set for ATC comms
* VHF 2/R is for internal company use, aircraft to aircraft and secondary ATC comms
* VHF 3/C is for ACARS data comms / backup
Dependency tree docs update
Merge branch 'master' of github.com:FlightDataServices/FlightDataAnalyzer

Conflicts:
	analysis_engine/flight_attribute.py
Autopilot documentation updated