rename parameter

bfps/DNS.py

bfps/PP.py

bfps/TEST.py

bfps/cpp/full_code/NSVE.cpp

bfps/cpp/full_code/NSVE.hpp

bfps/cpp/full_code/NSVE_field_stats.cpp

bfps/cpp/full_code/NSVE_field_stats.hpp

bfps/cpp/full_code/symmetrize_test.cpp

bfps/cpp/full_code/symmetrize_test.hpp