add/update copyright notices

CMakeLists.txt

bfps/DNS.py

bfps/PP.py

bfps/TEST.py

bfps/__init__.py

bfps/__main__.py

bfps/_base.py

bfps/_code.py

bfps/tools.py

cmake/BFPSConfig.cmake.in

cpp/full_code/NSVE.cpp

cpp/full_code/NSVE_field_stats.cpp

cpp/full_code/NSVEp_extra_sampling.cpp

cpp/full_code/NSVEp_extra_sampling.hpp

cpp/full_code/NSVEparticles_no_output.hpp

cpp/full_code/codes_with_no_output.hpp

cpp/full_code/direct_numerical_simulation.cpp

cpp/full_code/field_output_test.cpp

cpp/full_code/field_single_to_double.cpp

cpp/full_code/field_test.cpp