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
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
Slight performance enhancement for Const models.

See https://github.com/astropy/astropy/pull/3027#issuecomment-59576917
Moved column checking to before table instantiation
Moved single column check to actual reading
Merge pull request #3033 from embray/modeling/const-improvement

Slight performance enhancement for Const models
Merge pull request #2892 from mdmueller/improve-guessing

Made `_guess` avoid a couple cases in which Tables are instantiated and then ignored