Improve error message when ascii.read guessing fails
Fix #3007: Inherit docstrings on special members
Describe how to test with a particular config value.
Close mmap before closing file
Changes Model.inverse to a property that can be updated to return a custom inverse model when available.  Updates existing models and tests, and adds a test of the new feature.
Fix reference in docstring
Add getitem to MaskedColumn to copy attrs for slicing
Update CHANGES.rst [skip ci]
Add Table-level test of changing MaskedColumn attr and slicing
Explicitly free python buffer using PyBuffer_Release on python 3
Merge pull request #3026 from amras1/fix-open-file-error

Fix Mac/Python 3 issue with too many open files in io.ascii
Fix ``treat_deprecations_as_exceptions`` to recognize Astropy deprecation warnings.
Allow opt-out of treating astropy deprecation warnings as exceptions
Merge pull request #3015 from astrofrog/fix-treat-deprecations-as-exceptions

Fix ``treat_deprecations_as_exceptions`` to recognize Astropy deprecation warnings
Merge pull request #3007 from mdboom/misc/inherit-docstrings-fix

Make InheritDocstrings work for __call__
Update CHANGES.rst

Properly add reference to #3015.
Merge pull request #3014 from mdboom/config/improve-testing-doc

Improve documentation for testing with different config values
Outright removed .invert method per discussion in #3024
Added changelog entry
Slight performance enhancement for Const models.

See https://github.com/astropy/astropy/pull/3027#issuecomment-59576917