[doc] add missing images :)
[pocolibs] Fix pose computation for images

If there are some different frequencies on stereo and video_camera, it
is possible that the robot position when the shots are taken is not the
same than the one when we output data. So store properly the robot
position in camera_video, and use it to compute the transformation for
viam output.

While here, fix an odd rotation paramter.
[builder] Expose service thought socket for pr2 if asked
[testing] Fix the test, from a syntaxic point of view

Now, we get a chance to test something useful :)
[actuator] Make the return type of get_IK_min_max consistent

Use the same kind of return in both prismatic and rotation joint.
It fixes an issue in the call of translate, catched by the
pr2/torso-sockets test
[doc] move builder image -> media