add license and VF heading to files

Python/SlurmTests/poiseuille/settings.py

Python/acousticscaling.py

Python/actuator_line/actuator_line.py

Python/boundary_layer/boundary_layer.py

Python/cubeflow/simulation.py

Python/liddrivencavity/simulation.py

Python/poiseuille/poiseuille_hpc.py

Python/poiseuille/simulation.py

Python/poiseuille/test_poiseuille_l2.py

Python/tests/test_acousticscaling.py

Python/tests/test_boundaryconditions.py

Python/tests/test_geometry.py

Python/tests/test_kernel.py

apps/gpu/LBM/ActuatorLine/ActuatorLine.cpp

apps/gpu/LBM/BoundaryLayer/BoundaryLayer.cpp

apps/gpu/LBM/TGV_3D_MultiGPU/TGV_3D_MultiGPU.cpp

pythonbindings/pyfluids-stubs/bindings/__init__.pyi

pythonbindings/pyfluids-stubs/bindings/basics/__init__.pyi

pythonbindings/pyfluids-stubs/bindings/basics/logger.pyi

pythonbindings/pyfluids-stubs/bindings/gpu/__init__.pyi