Signal plot functions are now based on a single _base_plot() function
Signal plot functions are now based on a single _base_plot() function

- Next step is to use 1/1 and 1/3 ticks for these octaves. See
acoustics.imaging

python-acoustics/python-acoustics,antiface/python-acoustics,giumas/python-acoustics,felipeacsi/python-acoustics,FRidh/python-acoustics