Pint

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- Python 2.6 support
(Issue 96, thanks tiagocoutinho)
- Fixed symbol for inch.
(Issue 102, thanks cybertoast)
- Stop raising AttributeError when wrapping funcs without all of the attributes.
(Issue 100, thanks jturner314)
- Fixed warning appearing in Py2.x when comparing a Numpy Array with an empty string.
(Issue 98, thanks jturner314)
- Add links to AUR packages in docs.
(Issue 91, thanks jturner314)
- Fixed garbage collection related problem.
(Issue 92, thanks jturner314)

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- Integer Division with Arrays.
(Issue 80, thanks jdreaver)
- Improved Documentation.
(Issue 83, thanks choloepus)
- Removed 'h' alias for hour due to conflict with Planck's constant.
(Issue 82, thanks choloepus)
- Improved get_base_units for non-multiplicative units.
(Issue 85, thanks exxus)
- Refactored code for multiplication.
(Issue 84, thanks jturner314)
- Removed 'R' alias for roentgen as it collides with molar_gas_constant.
(Issue 87, thanks rsking84)
- Improved naming of temperature units and multiplication of non-multiplicative units.
(Issue 86, tahsnk exxus)

----------------

- Support for <NA> values in columns with integer magnitudes
- Support for magnitudes of any type, such as complex128 or tuples 146
- Support for Pint 0.21 168, 179
- Cast to `numpy.ndarray` in `PintArray._reduce` if needed to use `nanops` functions
- Minimum Pint version is 0.21
- Minimum Pandas version is 1.6

------------------

- ParseHelper can now parse units named like python keywords.
(Issue 69)
- Fix comparison of quantities.
(Issue 74)
- Fix Inequality operator.
(Issue 70, thanks muggenhor)
- Improved travis configuration.
(thanks muggenhor)

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- Fix get_dimensionality for non multiplicative units.
(Issue 66)
- Proper handling of import directive inside a file read using pkg_resources.
(Issue 68)

------------------

- fix right division on python 2.7
(Issue 58, thanks natezb)
- fix formatting of fractional exponentials between 0 and 1.
(Issue 62, thanks jdreaver)
- fix installation as egg.
(Issue 61)
- fix handling of strange values as input of Quantity.
(Issue 53)
- math operations between quantities of different registries now raise a ValueError.
(Issue 52)