Centerline extraction should not be done in `template_preprocessing.py`

[jcohenadad]

template/template_preprocessing.py

Lines 170 to 173 in 130f8a4

	else:
	print(subject_name + ' SC segmentation does not exist. Extracting centerline from ' + fname_image)
	im_seg = Image(fname_image).change_orientation('RPI')
	param_centerline = ParamCenterline(algo_fitting = 'optic', contrast = contrast, smooth = smooth, degree = 5, minmax = minmax)

To implement in https://github.com/neuropoly/template/edit/nb/updated_all