changed initial cond. for v=5ms to make nice circle
adding computation of heading angle to target destination
adding computation of difference between heading angle of airplane and reference heading to target destination
very first version of PID
working PID, basic version, no tuning
updated computation of load balance about braking force
adding moments from brake forces to computation of load balance equation
TODO: verify if load balancing during braking corresponds to reality
changing fonts in lateral force graphs
adding PID for velocity
hardcoded forces to be zero when v<par.min_velo, still some oscillations of slip angles and lateral forces