Turn ontology into TSV that can be used to create seperate NTRs

This pipeline documents the process of how to turn an input ontology, for example, an extension to HPO (recent example, seizures ontology), into a TSV file that can then be turned into GitHub issues using the HPO Workbench.

An example NTR generated this way is here: https://github.com/obophenotype/human-phenotype-ontology/issues/5486

These are the steps you need to do to generate the TSV:

1. Edit src/scripts/hpo_field_mappings.yaml to fit your use case.
2. Navigate to ontology dir as usual: cd src/ontology
3. Run the make command: sh run.sh make INPUT=../relative/path/to/ontology.owl tmp/ntr_tsv.tsv -B. For example: `sh run.sh make INPUT=../../scratch/HPOSeizures_OWL_v11_20191205.owl tmp/ntr_tsv.tsv -B

This should generate the TSV src/ontology/tmp/ntr_tsv.tsv with the NTRs.

Technical side note: The pipeline is realised as as series of make goals and this scripts: src/scripts/ntr_tsv.py.