[ros] Fix 'actions' unittest

Closes #228
[ros] waypoint overlay: use standard ROS MoveBaseAction

Since no standard MoveBase service exists, remove it.
[unittest][ros] {data_stream -> topics}

While here, remove useless ROS imports.
[ros] Implement action cancellation and preemption

Updated accordingly ros/actions.py unit-tests.

Closes #119
[unittest][ros] Removed 'services.py' from list of tests

...because no component use ROS services anymore...!
[ros] minor: remove useless imports
[example/tuto] fix typo and camera flip
[Examples] Typo and correct x-axis camera rotation
[Examples} Flying cat and mouse uses pymorse.
[examples] Name correction and change directory.
[human] Make it possible to change the human name

Should work with several humans as well, but not tested.
Closes #237
[doc] install ROS add distribute
[helpers] clean loading