Merge branch 'concatenate_scripts' into 'master'

Makefile

docs/getting_started.rst

docs/tools.rst

examples/make_data_split_config.toml

orcasong/extractors.py

orcasong/tools/make_data_split.py

orcasong_contrib/__init__.py

orcasong_contrib/data_tools/__init__.py

orcasong_contrib/data_tools/concatenate/__init__.py

orcasong_contrib/data_tools/concatenate/concatenate_h5.py

orcasong_contrib/data_tools/make_data_split/__init__.py

...plit/configs/config_bg_classifier_xyz-c_tight-0_100b.toml

...plit/configs/config_bg_classifier_xyz-t_tight-0_100b.toml

...ta_split/configs/config_regression_xyz-c_tight-1_60b.toml

...ta_split/configs/config_regression_xyz-t_tight-1_60b.toml

.../make_data_split/configs/config_ts_xyz-t_tight-1_60b.toml

.../make_data_split/configs/config_ts_xyz-t_tight-2_60b.toml

...ng_contrib/data_tools/make_data_split/example_config.toml

orcasong_contrib/data_tools/shuffle/__init__.py

orcasong_contrib/data_tools/shuffle/shuffle_h5.py