Barril

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* Add ``mole per mass`` quantity (``mol/kg``).

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* Update ``Newton second per meter`` unit from ``Ns/m`` to ``N.s/m`` to get unit display consistent with other units in the same category (support for the old unit input added).
* Add ``force per velocity squared`` quantity (``N.s2/m2``, ``lbf.s2/ft2``, ``lbf.s2/in2``, ``kgf.s2/m2``).

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* ``barril`` is now fully type annotated, being tested with ``mypy``.
* ``Array`` and ``FixedArray`` are ``Generic`` subclasses, parametrized by the container type.

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* Fixed typos in unit names: ``kilkodynes`` (unit=kdyne) fixed to ``kilodynes``, ``killowatts/cubic metre degree Kelvin`` (unit=kW/m3.K) fixed to ``kilowatts/cubic metre degree Kelvin``.

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* Add new unit: "Stokes" (``St``).
* Use ``TypeCheckingSupport`` from ``oop-ext 1.1``.
* Add ``cubic feet per day per psi`` (``ft3/psi.d``) unit to ``productivity index`` category.
* Add ``calories/metre hour degree Celsius`` (``cal/m.h.degC``) unit to ``thermal conductivity`` category.
* Add ``calorie/hour square metre deg C`` (``cal/h.m2.degC``) unit to ``heat transfer coefficient`` category.
* Add ``std cubic metres/second`` (``sm3/s``) unit to ``standard volume per time`` category.
* Add ``million std cubic feet/stock tank barrel`` (``MMscf/stb``), ``stock tank barrel/std cubic feet`` (``stb/scf``) and ``stock tank barrel/million std cubic feet`` (``stb/MMscf``) units to ``standard volume per standard volume`` category.

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* Removing ``thermodynamic temperature`` as default category for ``degF`` and ``degR`` units.