Add the tile datatype information
This small PR just add the datatype field into the CHAM_tile_t structure in order to prepare the field for mixed precision algorithms
[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
This small PR just add the datatype field into the CHAM_tile_t structure in order to prepare the field for mixed precision algorithms