Update to new version of hpp-core

  cut dependency to kitelab and jrl-dynamics,
  implement roadmap, problem, path planner...
Enhance documentation.
Give access to reference of the value of a locked dof.
When inserting a ConfigProjector in ConstraintSet, remove dummy ConfigProjector.
Add a method to reset consstraint set in problem solver.
Add documentation.
Fix locked degree of freedom computations.
Cosmetic change: remove some debug output.
Update README.md
Fix doxygen links between types and shared pointers to types.
Include config.hh in path-validation.hh.
Extend use of Eigen::Ref to input/output vectors and configurations.
Update dependency version numbers before release.
Fix bug in random-shortcut.
Fix warning introduced by modification in hpp-model.