Remove loading of npz for centerline

[jcohenadad]

Remove this:

template/template_preprocessing.py

Lines 161 to 165 in c68e903

	# if centerline exists, we load it, if not, we compute it
	if os.path.isfile(fname_centerline + '.npz') and not regenerate:
	print("Centerline for " + subject_name + " exists and will not be recomputed!")
	centerline = Centerline(fname = fname_centerline + '.npz')
	else:

because we just want to regenerate it all the time-- for reliability purpose

also, we don't need to save the npz, so remove:

template/template_preprocessing.py

Lines 161 to 165 in c68e903

	# if centerline exists, we load it, if not, we compute it
	if os.path.isfile(fname_centerline + '.npz') and not regenerate:
	print("Centerline for " + subject_name + " exists and will not be recomputed!")
	centerline = Centerline(fname = fname_centerline + '.npz')
	else:

[NadiaBlostein]

Fixed with PR #53 nb/preprocess_segment, last commit (0ca0cd4b469cd99bf521a6ada765bc93b85adebf)