ReadTheDocs - which methods too include and formatting issues

[kysolvik]

ReadTheDocs site is up: https://dataassimbench.readthedocs.io/en/latest/index.html

But two major problems:

1. Used Sphinx AutoAPI to generate API Reference, but included internal methods (_*). Needed this to capture public methods in non-public modules. Should either make those modules public or tweak the AutoAPI config.
2. Some docstring formatting issues. Missing newline in attribute descriptions, e.g.: https://dataassimbench.readthedocs.io/en/latest/autoapi/dabench/data/gcp/index.html

[kysolvik]

Fixed by #70 . Closing issue.