Chempy

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- Enhancements for ``.units.is_unitless`` & ``.units.get_physical_quantity``
- New functions in ``chempy.units``: ``compare_equality`` & ``uniform``.

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- Fix bug in Reaction.check_consistent_units

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- More relaxed tests with respect to 3rd party programs

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- Extensive test suite in conda package no longer require graphviz & latex

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- ``balance_stoichiometry`` now accepts either of ``True``, ``False``, ``None`` as ``underdetermined``.
- ``NameSpace`` and ``AttributeContainer`` are now public in ``.util.pyutil``.
- New printers in ``chempy.printing``, allows user to subclass printers.
- Jupyter Notebook representation of ``ReactionSystem`` is now interactive (JavaScript/CSS)
- More data from the literature: water viscosity (``chempy.properties.water_viscosity_korson_1969``).
- New methods for ``ReactionSystem``:
- ``split``: splits reaction-system into disjoint parts
- ``categorize_substances``: e.g. "nonparticipating", "unaffected".
- Better documentation throughout.

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- New option in ``.kinetics._native.get_native``: conc_roots