Update start robot
the start_robot method in the control module should not make the robot stand (in fact it should only be kept if it's needed for the robot to turn head).
Rename to turn_motors_on if it is to be kept
the start_robot method in the control module should not make the robot stand (in fact it should only be kept if it's needed for the robot to turn head).
Rename to turn_motors_on if it is to be kept