General refactoring

bip/pipelines/struct_FS/FS_get_IDPs_fnc.py

bip/pipelines/struct_FS/FS_proc.py

bip/pipelines/struct_FS/FS_segm.py

bip/pipelines/struct_FS/__init__.py

bip/pipelines/struct_T1/T1_QC_CNR_corners.py

bip/pipelines/struct_T1/T1_QC_CNR_eyes.py

bip/pipelines/struct_T1/T1_QC_COG.py

bip/pipelines/struct_T1/T1_brain_extract.py

bip/pipelines/struct_T1/T1_defacing.py

bip/pipelines/struct_T1/T1_fast.py

bip/pipelines/struct_T1/T1_first.py

bip/pipelines/struct_T1/T1_gdc.py

bip/pipelines/struct_T1/T1_sienax.py

bip/pipelines/struct_T1/__init__.py

bip/pipelines/struct_T1/struct_T1.py

bip/pipelines/struct_T2_FLAIR/T2_FLAIR_apply_bfc.py

bip/pipelines/struct_T2_FLAIR/T2_FLAIR_bianca.py

bip/pipelines/struct_T2_FLAIR/T2_FLAIR_brain_extract.py

bip/pipelines/struct_T2_FLAIR/T2_FLAIR_defacing.py

bip/pipelines/struct_T2_FLAIR/T2_FLAIR_gdc.py