fix submodule url

[python] Add method to get actuated joints

fix tests without ROS PACKAGE_PATH

  in python class AbstractRobot.

[CMake] install package.xml

Boost 1.73 added a boring warning about deprecated use of boost bind,
which is still used by boost python.

As of Boost 1.75, this is still not fixed:
boostorg/python#296
boostorg/python#315

ref https://github.com/stack-of-tasks/eigenpy/pull/216

Fix error with prerelease on ROS

Update package.xml for ROS release

Release of version 3.6.0.

Remove sphinx