Use `\overset{\circ}A` for Angstrom LaTeX.
Include an example of how to skip all doctests in a module
Allow float, int, long of any dimensionless quantity, even if not unscaled
Update documentation to reflect that all dimensionless scalars can be converted
Add changelog entry in API change section
Allow the use of non-local ReadMe files in the CDS reader
Documentation of the CDS reader class updated
General documentation updated with an example of the load of CDS tables using URLs
Should somewhat fix or at least improve the situation reported in
https://github.com/astropy/astropy/issues/2305 by ensuring that the
method (_ImageBaseHDU.update_header) responsible keeping an HDU's header
in sync with the data it represents, also makes the necessary updates to
ensure that the header contains the correct BZERO value for
pseudo-unsigned integers.
Upgrade to wcslib 4.22
Fix a couple sets of tests in modeling. This has two problems: One was the use of parameters.values() in a context where the order of the parameter values *does* matter. The fact that it was working before was only by luck.  The other problem was that it modified global state, causing subsequent test executions to break.
Updated CHANGES.rst
Merge pull request #2286 from mdboom/unit/angstrom with manual merge

Added CHANGES.rst entry
Remove Quantity.__eq__, __ne__ so that == and != always return True, False
Add extra test, entry in backwards-incompatible changes
Tighten up test that __eq__, __ne__ really return True, False
for units that cannot be converted
Merge pull request #2328 from mhvk/quantity-equality

Remove Quantity.__eq__, __ne__ so that == and != always return True, False
Make ellipsoid a property with a setter; add tests; use _new_view
Merge pull request #2249 from mhvk/quantity-float-int-long

math functions don't decompose quantities correctly
Rename calcFootprint to calc_footprint. Add an optional boolean keyword center which controls whether to use the center of the corner of the pixel.