CLIMATE-550 - Drop bottlemet module from ocw-ui backend code
CLIMATE-551 - Drop old RCMET toolkit from codebase
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.
CLIMATE-487 - Improve error message when local dataset load fails

- Explicit RuntimeErrors are not properly handled to alert the user that
  the supplied file path is invalid. This helps clarify user
  controllable failures.
- Attempt to make the generic error on dataset loading a bit more
  descriptive to help users.
CLIMATE-371 - Allow user to pass variable names to local.py
Resolve CLIMATE-487. Merge PR #131.
Resolve CLIMATE-371. Merge PR #132.
Resolve CLIMATE-550. Merge PR #128.
Resolve CLIMATE-551. Merge PR #129.