[robots/grasping_robots] Initialize properly DraggedObject game property
[builder] Add a method to enable the grasping capacity to a robot

Enable it for human.
For PR2, I don't have any idea how to call it at the morse.robot.pr2
speaks about Hand.Grasp.PR2, which does not exists ...
Should fix #565
[sensors] Add a radar altimeter sensor

This sensor is supposed to measure the distance of an 'aircraft'
relative to the 'ground'.
[doc] Mention the addition of Radar Altimeter sensor
[basics.blend] Rotate the hud to display the image in the right sense

Reported by Felix Ruess on morse-users@
[mw/yarp] Fix the orientation of image

While here:
- move the Publisher in a specific file and adapt builder data file
- remove now incorrect patch
- improve python style

Moreover, it must improve the performance of the Yarp Image Publisher as
it avoids one useless copy
[builder] fix few occurrences of removed method

commit d58d0525eb8ef71975ad75431e3de14581dc45ed broke few files
[builder] fix few occurrences of removed method

commit d58d0525eb8ef71975ad75431e3de14581dc45ed broke few files (2)
[builder] Fix fallout from the move of YarpImagePublisher in its own module
[pymorse] wait for publisher when closing

fix #567