NEW: function smoothing_window allows to smooth a 1D curve using the convolution of a ponderation window (flat, hanning, blackman...)
NEW: function smoothing_window allows to smooth a 1D curve using the convolution of a ponderation window (flat, hanning, blackman...)

Former-commit-id: 68139d42b318b2f66c6a5059c44214635d35b1f6
Former-commit-id: 19196b36a159fb171b6e22c1ca4e5f8ec526848e
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox