Fix Zander altitude transmission error causing overflow .
Fix AltitudeToQNHAltitude overflow when impossible altitude is requested
Fix pressure function AirDensity overflow with impossible altitude
Do not reset flight if a gps has gone back in time after takeoff..
Tune Kalman wind calculation: do not reset the matrix if airspeed is missing.
Wait for 30 minutes with no samples before resetting the matrix, too.
Ditto..
update changes
This is version 4.1n