Revert "Use jrl-cmakemodules macros and install Python files to site-packages."

This reverts commit 7e316e2c9cecfbb70652267f7e8dcdac17992079.
Fix project url.
Add MultiBodyGraph::jointByName and MultiBodyGraph::jointIdByName method.
Arm creation function must return mbg.
Allow to destroy some joint in MultiBodyGraph. This allow to remove virtual links.
Forget to remove Node from bodyId2Node_.
Allow to merge bodies in MultiBodyGraph.
Check that Body id and Joint id are not less than zero in MultiBodyGraph.
Fix an uninitialised value valgrind error.
Update python binding.
Add MultiBodyGraph::bodyIdByName.
Add copy constructor and opertor= to MultiBodyGraph.
Remove scripts directory.
Remove memory leak in MultiBodyGraph.
Add CentroidalMomentum computation.
Add computeCentroidalMomentum to python binding.
Add computeCentroidalMomentumDot function.
Refactor CentroidalMomentumMatrix API.
Fill CentroidalMomentumMatrix::matrixDot method.
Update CentroidalMomentumMatrix documentation.
Add safe method to CentroidalMomentumMatrix.
Create a python binding to CentroidalMomentumMatrix.
Use bodiesWeight_ in CentroidalMomentumMatrix::computeMatrix*.