Generate the docstrings in _wcs.so using character arrays rather than
string literals.  This is (reportedly) more portable and avoid the
copying nonsense we did before.
Add subok and other np.array parameters
subok also for __quantity_view__, __quantity_instance__; more tests
Propagation of __quantity_view__, instance__ to subclasses
Simplify Quantity subclassing API, replacing __quantity_view__ and
__quantity_instance__ with __quantity_subclass__ and __quantity_finalize__.
Simplify _new_view, _new_instance further, remove __quantity_finalize__
Further simplification, using only _new_view
Simplify __quantity_subclass__ a little
Add tests for quantity.view; use _unit in __array_finalize__
Pass unit through Unit (fast if UnitBase already); use to simplify further
Add a brief summary about how to subclass quantity to the documentaion
Update subclass documentation following comments from @eteq
Further update to quantity subclassing documentation
Introducing main-docs-only option for automod api to be used in astropy.io.fits documentation.
Fixing bug in test_automodapi.py
address #1185
Change sort of registered readers/writers to avoid comparing types

Closes #2312
A couple other references unusable outside of Sphinx
Fix formatting issues in CHANGES.rst
Apply changes according to comments in PR