Allow for `kind` kwarg to Table.argsort
Use mergesort alg for groups sorting to maintain order
Fall through to default quicksort if mergesort fails
Add unicode and latex aware liter symbol
Reorganize units docs to emphasize Quantity over Unit.
Elaborate on uses of CDS unit standard
Use a mixed-unit example for Quantity-instantiated-by-list
Fix undefined reference target errors
Fix rst doctests in coordinates package
Fix .rst doctests in constants package
Fix .rst doctests in config package
Wrap to 80 columns
Use the current sys.stdout, rather than the sys.stout at the time of
import, as a default.
Fix Sphinx warnings
Force stable sort for grouping
Update CHANGES.rst

Remove unnecessary changelog entry.  See https://github.com/astropy/astropy/pull/1613/files#r7163815
Fix rst doctests in units package
Remove Quantity convenience accessor example -- this was added and
removed during the 0.3 cycle.