Fix #1809: All-masked integer columns are written as <TD/>, even though
that violates the VOTable standard prior to version 1.3
Band-aid cyclical import problems that prevent running packages that
define Table types on their own in the test framework.
Add test for out-of-range null value
Fix regression test for io.votable.validate
Add CHANGES entry
Use major.minor format in the version string of the sphinx configuration file
Fix some typos in stats docs
Remove broken link

One of the link containing more information on the function `super()`
was broken. Fixes #1376
Speed-up of quantity initialisation
Change try/except to if statement that checks for more specific problem
Further speedup: no local import(!), return whenever ready
Make Quantity initialisation of Quantity even faster
Add entry to CHANGES.rst
Change to epoch_scale earlier for TimeFromEpoch; closes #1122
Add test cases, TimePlotDate correction
Merge pull request #1809 from mdboom/vo/empty-fields

How to use ``astropy.io.votable`` to fix non standard-compliant tables?
Add note to CHANGES.rst
Correction to plot_date doctest in docs/time/index.rst
Try changing empy lines in CHANGES.rst to get rid of
Reword CHANGES.rst to make more obvious to non-intimi what problem was fixed.