Fixedwing navigation in a 3D spiral. creating a helix: - start center (X, Y) - start and stop altitude - start and stop radius - 3D speed of the circle - in case alt diff is too small, vz is used as expension speed at constant altitude - in case of radius diff too small, doing a constant radius circle - if alt diff is too small, basic circle with horizontal speed (vz as no effect) setup will fail if: - alt diff and vz are not coherent - vz is too small and not doing circle

@navigation @mission