AP_TECS : Speed weighting fade added during landing approach
AP_TECS : Added airspeed increment during landing stages
AP_TECS : Added flight mode for maximum range
AP_TECS : Reduce tendency to overspeed during climbout

The old code relies on the action of the integrator to raise the nose above the minimum pitch angle which depending on the model and the tuning can be too slow to correct. Biasing the pitch angle to climbout minimum will reduce the taken before an overspeed condition is corrected.
AP_TECS : Shortened parameter name to enable mission planner write
Plane : Added parameter and code to enable maximum range mode to be selected
APM_Control : Moved scaler on roll and pitch integrator to be before integrator

This means that the value of aileron and elevator trim offset won't change with airspeed
Plane : Added code to inhibit max range speed mode when circling a waypoint
AP_TECS : Added 5sec time constant low-pass filter to max range airspeed demand
AP_TECS : Speed weighting fade added during landing approach
AP_TECS : Added airspeed increment during landing stages
AP_TECS : Added flight mode for maximum range
AP_TECS : Reduce tendency to overspeed during climbout

The old code relies on the action of the integrator to raise the nose above the minimum pitch angle which depending on the model and the tuning can be too slow to correct. Biasing the pitch angle to climbout minimum will reduce the taken before an overspeed condition is corrected.
AP_TECS : Shortened parameter name to enable mission planner write
Plane : Added parameter and code to enable maximum range mode to be selected
Plane : Added code to inhibit max range speed mode when circling a waypoint
AP_TECS : Added 5sec time constant low-pass filter to max range airspeed demand
Merge branch 'landspeed-wip' of github.com:priseborough/ardupilot into landspeed-wip

* 'landspeed-wip' of github.com:priseborough/ardupilot:
  AP_TECS : Added 5sec time constant low-pass filter to max range airspeed demand
  Plane : Added code to inhibit max range speed mode when circling a waypoint
  APM_Control : Moved scaler on roll and pitch integrator to be before integrator
  Plane : Added parameter and code to enable maximum range mode to be selected
  AP_TECS : Shortened parameter name to enable mission planner write
  AP_TECS : Reduce tendency to overspeed during climbout
  AP_TECS : Added flight mode for maximum range
  AP_TECS : Added airspeed increment during landing stages
  AP_TECS : Speed weighting fade added during landing approach
AP_Airspeed : Fixes bug that caused airspeed calibration to be sent a zero airspeed

This bug resulted in the airspeed ratio going to the maximum value of 4 and staying there. This could lead to a very slow flying model and a stall.