Merge branch 'extrf' into 'master'

configs/bundle_ORCA4_data_v5-40.toml

orcasong/__version__.py

orcasong/core.py

orcasong/extractors/__init__.py

orcasong/extractors/bundles.py

orcasong/extractors/neutrino_chain.py

orcasong/from_toml.py

orcasong/modules.py

orcasong/parser.py

orcasong/plotting/binning.py

orcasong/plotting/plot_binstats.py

orcasong/tools/concatenate.py

orcasong/tools/make_data_split.py

orcasong/tools/postproc.py

orcasong/tools/shuffle2.py