FEM: unit tests, solver frame work, typo in ccx solver test
FEM: unit tests, solver frame work, typo in ccx solver test

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