FEM: make FemMesh::getVolumesByFace() working for SMESH >= 7
FEM: make FemMesh::getVolumesByFace() working for SMESH >= 7

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master