Remove simulation member and replace simu by device in AbstractRobot class.

src/dynamic_graph/sot/dynamics/humanoid_robot.py

unitTesting/python/dynamic_walk.py

unitTesting/python/feet_follower.py

unitTesting/python/quasistatic_walking.py

unitTesting/python/reach_both_hands.py

unitTesting/python/reach_left_hand.py

unitTesting/python/reach_right_hand.py

unitTesting/python/tools.py