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
advance to next beta
Fixed missing terminating " character
Add infoboxes 128 and 129 for Alternate1 and Alternate2 radials.
The name of alternate waypoint is printed, after a "<" character which
is there to indicate the radial value, opposite to bearing angle.

Fix missing 127 infobox for Bank Angle already existing.
Do more tight busy wait timings on startup
ditto
Fix typo in eng msg
Revert "Fix Glide Bar should not be visible when there is no valid start, if it is configured to show task arrival altitude."

This reverts commit 07d98ea709cadee62da912bc6b633222157ce416.
Fix glidebar not available (and showing ---) when showing T multitarget, with a real task, in FINISH mode, but with not a real valid start yet.
Add new infobox for Heading . Showing magnetic heading if available from an external instrument; otherwise showing
the estimated heading calculated internally.
correct typo in eng msg
Disable AHRS too experimental
Fix device driver LX not reading the magnetic heading if available
Fix HeadWind calculation using TAS if available. This value is shown in infoboxes.