caltechlibrary/dataset: Py module improvements

Description

Improved error message in running tests for Python Module, updated docs to indicate we require Python 3.6. Add python module method use_strict_dotpath() to configure whether or not a dotpath error is treated as a warning or failure.

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Dataset is a command line tool for working with JSON (object) documents on local disc, in an S3 bucket or on Google Sheets/Cloud Storage

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