Mine usage of Python libraries using OSCAR dataset

Usage:

./filenames.py -o filenames.csv
./projects.py -i filenames.csv -o projects.csv
./ubase.py -i projects.csv

Recommended usage:

mkdir snapshots

./filenames.py | tee filenames.csv | \
    ./projects.py -S snapshots | tee projects.csv | \
    ./ubase.py -S snapshots -v -o ubase.csv