debugging:

    * [new] Added a program to check the trapezoidal profile. The program displays the position, the velocity and the acceleration of the movement, given constraints and initial conditions. (trapezoidal-profile.py)

    * [new] Added a program to check the double-S profile. The program displays the position, the velocity, the acceleration and the jerk of the movement, given constraints and initial conditions. (doubleS-profile.py)