update code name in python files

setup.py

turtle/DNS.py

turtle/PP.py

turtle/TEST.py

turtle/__init__.py

turtle/__main__.py

turtle/_base.py

turtle/_code.py

turtle/test/test_Parseval.py

turtle/test/test_bfps_NSVEparticles.py

turtle/test/test_bfps_resize.py

turtle/test/test_fftw.py

turtle/test/test_interpolation.py

turtle/test/test_particle_clouds.py

turtle/test/test_particles.py

turtle/tools.py