Python GIL not released before entering the C++ library

[ymollard]

I would like to reanimate the investigations about the GIL following this thread and the suggestion of Wouter: https://groups.google.com/d/topic/moveit-users/juXENC4XoRo/discussion

It looks like all threads are stopped, avoiding tf.TransformListener to be up to date and also avoiding subscribers to receive new messages since they are all threaded in Python.

It looks a major issue to me, forcing the user to rospy.sleep() after each call to MoveGroup to let threads getting new updates before continuing execution.