CLIMATE-552 - Drop unused private functions from local.py
CLIMATE-552 - Remove dead code from local.py
CLIMATE-552 - Comments and minor code cleanup

- Cleanup doc strings and in-line documentation.
- Remove unneeded list conversions of sets.
CLIMATE-552 - Line length fixes and readability fixes

- Correct PEP-8 incompatible line lengths.
- Adjust variable name and add additional comments to load_file for
  clarity.
CLIMATE-552 - Clean up imports in local.py
Resolve CLIMATE-552. Merge PR #130.