- fix in GLS due to positive gains
- new vertical controll "energyadaptive"
  -energy ctl from TUDelft+adaptive stabilisation with some additionals
  -grounspeed protection
  -predefined values
fix due to guidance_common.h
PPM input to UART1 with configuration option to Servo 6
[ahrs] improve gravity heuristic for int_cmpl_quat
* use the centrifugal force corrected gravity for heuristic
* FIR filter for gravity heuristic measurements
* increase gain on gravity heuristc
Total Energy Control for Fixedwing
Nav Include Problem
Full 100Hz airspeed control
Reduce overflow change in AHRS
[fixedwing] fix nav_catapult and energy_ctrl to take acceleration of body and not imu x-axis
[stm32][ground_segment] Add UART hardware flow control
* ground segment: serial ocaml lib, link and logalizer
* Added UART hardware flow control to UART1 for STM32
Fix altitude control in advanced polygon survey
Rate Limiter for Flaps, Gears and servo hatches or any other feature that needs a static variable in the command section.
[modules] Update Photogrammetry Calculator
[modules] digital_cam: Shoot on button release
[modules] update digital_cam docs
gps acceleration compensation in ahrs_float_dcm
[ahrs] refactor gps info in float_dcm so we can run the tests on it
[tests] improve ahrs test scripts
* added bungee_takeoff trajectory
* some fixes to test float_dcm
[lib/ocaml] use ocaml Http_client from netclient lib to download files
* used e.g. to dowload tiles
* raises Blocked if we get a 403 and raises Not_Found on a 404,
  only if we get a Not_Found we try the next zoom level
* in case we get blocked, it still tries the next tile...
  maybe we should stop trying to get tiles at all in that case
first release candidate for next release v4.2