Download and convert data from PAJ.
See https://git.nomics.world/dbnomics-fetchers/documentation/wikis/code-style
python3 download.py <source-dir>1st time, create a virtual env and install requirements with:
pip install -r requirements.txtelse:
python3 convert.py <source-dir> <target-dir>Folders ../paj-source-data and ../paj-json-data must exist