error in get_dimX_K for fft3d.mpi_with_fftwmpi3d
I think there is an error in get_dimX_K for the class fft3d.mpi_with_fftwmpi3d
It gives (1 0 2) (in accordance with https://fluidfft.readthedocs.io/en/latest/ipynb/executed/tuto_fft3d_mpi_domain_decomp.html#summary) and not (1 2 0) which is the good solution.