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Added [versioneer](https://github.com/warner/python-versioneer) versioning support.
Minor update of version number in `setup.py`.
Implements new CIF I/O functions: load, loads, dump, dumps. Includes new tests.
Significant changes to API, including: * PEP8-complaint class and function naming * Simplification of module structure * Removal of redundant tests and conversion of testing to pylint
A minimum translation of the code from the original form, with an upgrade to Python 3. This release corresponds to https://pypi.org/project/mmcif-pdbx/0.0.1/