Fixing numerics

CMakeLists.txt

...lver<double>_lid_driven_cavity_3d_p1_grid_0_test_GCC8.vtk

...lver<double>_lid_driven_cavity_3d_p2_grid_0_test_GCC8.vtk

...lver<double>_lid_driven_cavity_3d_p2_grid_1_test_GCC8.vtk

...lver<double>_lid_driven_cavity_3d_p3_grid_0_test_GCC8.vtk

...lver<double>_lid_driven_cavity_3d_p3_grid_1_test_GCC8.vtk

...lver<double>_lid_driven_cavity_3d_p3_grid_2_test_GCC8.vtk

..._solver<double>_lid_driven_cavity_p1_grid_0_test_GCC7.vtk

..._solver<double>_lid_driven_cavity_p2_grid_0_test_GCC7.vtk

..._solver<double>_lid_driven_cavity_p2_grid_1_test_GCC7.vtk

...fpack_solver<double>_lid_driven_cavity_p3_grid_0_test.vtk

..._solver<double>_lid_driven_cavity_p3_grid_0_test_GCC7.vtk

...fpack_solver<double>_lid_driven_cavity_p3_grid_1_test.vtk

..._solver<double>_lid_driven_cavity_p3_grid_1_test_GCC7.vtk

...fpack_solver<double>_lid_driven_cavity_p3_grid_2_test.vtk

..._solver<double>_lid_driven_cavity_p3_grid_2_test_GCC7.vtk