Merge pull request #405 from jcarpent/topic/ag-variation

bindings/python/algorithm/expose-crba.cpp

bindings/python/multibody/data.hpp

bindings/python/spatial/motion.hpp

src/algorithm/crba.hpp

src/algorithm/crba.hxx

src/multibody/constraint.hpp

src/multibody/joint/joint-free-flyer.hpp

src/multibody/joint/joint-planar.hpp

src/multibody/joint/joint-prismatic-unaligned.hpp

src/multibody/joint/joint-prismatic.hpp

src/multibody/joint/joint-revolute-unaligned.hpp

src/multibody/joint/joint-revolute.hpp

src/multibody/joint/joint-spherical-ZYX.hpp

src/multibody/joint/joint-spherical.hpp

src/multibody/joint/joint-translation.hpp

src/multibody/model.hpp

src/multibody/model.hxx

src/spatial/inertia.hpp

src/spatial/motion.hpp

src/spatial/skew.hpp