Make the cmake config relocatable
Make the cmake config relocatable as per https://cmake.org/cmake/help/v3.9/manual/cmake-packages.7.html#creating-relocatable-packages
[A venir] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
[Coming soon] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
Make the cmake config relocatable as per https://cmake.org/cmake/help/v3.9/manual/cmake-packages.7.html#creating-relocatable-packages