Allow creating DIPs based on bhl_inventory.csv in make_dips.py; Add four new QC scripts

[hyeeyoungkim]

This pull request includes a major change (creating DIPs based on bhl_inventory.csv) to make_dips.py and four additional quality control scripts:

• check_empty_folder: Check for empty sub-directories and files in a directory.
• check_missing_folder: Check for missing sub-directories by comparing directory and bhl_inventory.csv
• check_output_structure: Check for RipStation output structure.
• check_thumbs_db_ds_store: Check and DELETE Thumbs.DB and .DS_Store files in a directory.

README.md has been updated to reflect the changes. The scripts have been tested with a large CD-based accession on Windows, Python 3.7.

[eckardm]

This is excellent, excellent work Hyeeyoung! The only thing I'd recommend for the future is more consistently descriptive commit messages and pull requests! E.g., instead of "updated readme" something like "added X, Y, Z to table of contents." You might also scope them to single updates or features.

That said, this is great work!

Thank you!