Merge branch 'model-cleanup' into 'master'

bob/ip/binseg/models/driu.py

bob/ip/binseg/models/driu_bn.py

bob/ip/binseg/models/driu_od.py

bob/ip/binseg/models/driu_pix.py

bob/ip/binseg/models/hed.py

bob/ip/binseg/models/losses.py

bob/ip/binseg/models/m2unet.py

bob/ip/binseg/models/make_layers.py

bob/ip/binseg/models/normalizer.py

bob/ip/binseg/models/resunet.py

bob/ip/binseg/models/unet.py

bob/ip/binseg/script/experiment.py

bob/ip/binseg/script/predict.py

bob/ip/binseg/script/train.py

bob/ip/binseg/test/test_checkpointer.py

bob/ip/binseg/test/test_cli.py

bob/ip/binseg/test/test_models.py

bob/ip/binseg/test/test_summary.py

bob/ip/binseg/utils/checkpointer.py

bob/ip/binseg/utils/model_serialization.py