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