[actuators] fix tilt w/ instant position orientation change
[test] lower delta difference images

Previous commit fix the robot tilt,
allowing us to lower the delta of the difference between captured and
expected (saved) images.
While here, use PGM P2 only (ascii image)
[builder] rename _blendobj in _bpy_object

To avoid confusion with bge object (Blender Game Engine)
used elsewhere in MORSE:
src/morse/core/object.py: self.blender_obj
While here, rename _blendname in _blender_filename (more readable)
[builder] set armature default filename
[builder] configure_service to add_service

While here, remove internal only fromer link_mw not used anymore
Fix armature creation in Builder script

-> Amend commit 65cc84f08
[ros] Fix typo in ros_request_manager
Replace a try except by member existance test in abstractcomponent
[builder] Put ArmatrePose in right alphabetical order