removed all useless fortran copies, enabled f2py copy verbosity flag by default

CMakeLists.txt

hysop/backend/host/fortran/operator/diffusion.py

hysop/backend/host/fortran/operator/fortran_fftw.py

hysop/backend/host/fortran/operator/poisson.py

hysop/backend/host/fortran/operator/poisson_rotational.py

hysop/backend/host/python/operator/poisson.py

hysop/fields/cartesian_discrete_field.py

hysop/numerics/fftw_f/fftw2py.f90

hysop/numerics/fftw_f/fftw2py.pyf

hysop/operator/base/diffusion.py

hysop/operator/tests/test_diffusion.py

setup.py.in