[T] Serial test for xdmf/hdf output

ProcessLib/SteadyStateDiffusion/Tests.cmake

..._1x1x1_SteadyStateDiffusion/xdmf/cube_1e4_anisotropic.prj

...ube_1e4_anisotropic_cube_1x1x1_hex_1e4_material_groups.h5

...1x1_hex_1e4_material_groups_cube_1x1x1_geometry_left.xdmf

..._material_groups_cube_1x1x1_geometry_left_back_lower.xdmf

..._material_groups_cube_1x1x1_geometry_left_back_upper.xdmf

...material_groups_cube_1x1x1_geometry_left_front_upper.xdmf

...1_hex_1e4_material_groups_cube_1x1x1_geometry_origin.xdmf

...x1_hex_1e4_material_groups_cube_1x1x1_geometry_right.xdmf

...material_groups_cube_1x1x1_geometry_right_back_lower.xdmf

...material_groups_cube_1x1x1_geometry_right_back_upper.xdmf

...aterial_groups_cube_1x1x1_geometry_right_front_lower.xdmf

...aterial_groups_cube_1x1x1_geometry_right_front_upper.xdmf

...material_groups_cube_1x1x1_geometry_right_upper_back.xdmf

...4_material_groups_cube_1x1x1_hex_1e4_material_groups.xdmf

...iptic/cube_1x1x1_SteadyStateDiffusion/xdmf/cube_1x1x1.gml

...x1_SteadyStateDiffusion/xdmf/cube_1x1x1_geometry_back.vtu

..._SteadyStateDiffusion/xdmf/cube_1x1x1_geometry_bottom.vtu

...1_SteadyStateDiffusion/xdmf/cube_1x1x1_geometry_front.vtu

...x1_SteadyStateDiffusion/xdmf/cube_1x1x1_geometry_left.vtu