Cleanup and fixes.

CHANGELOG.md

augment_dataset.py

configs/train-conll03-context.yaml

conlleval.py

core/poldeepner.py

evaluate_tsv.py

poldeepner2/data/document.py

poldeepner2/data/span.py

poldeepner2/data/token.py

poldeepner2/io/debug.py

poldeepner2/model/hf_for_token_calssification.py

poldeepner2/models.py

poldeepner2/pipeline/lemmatization.py

poldeepner2/pipeline/tokenization.py

poldeepner2/utils/annotation.py

poldeepner2/utils/data_utils.py

poldeepner2/utils/file_utils.py

poldeepner2/utils/preprocess.py

poldeepner2/utils/seed.py

poldeepner2/utils/sequence_labeling.py