* raise exception if _missing_ returns None or invalid type

* Fix enum members getting shadowed by parent attributes
* Move Enum._convert to EnumMeta._convert_
* Deprecate _convert

* bpo-33217: Raise TypeError for non-Enum lookups in Enums

* bpo-31801:  Enum:  add _ignore_ as class option

_ignore_ is a list, or white-space seperated str, of names that will not
be candidates for members; these names, and _ignore_ itself, are removed
from the final class.

* bpo-31801:  Enum:  add documentation for _ignore_

* bpo-31801: Enum: remove trailing whitespace

* bpo-31801: Enum: fix bulleted list format

* bpo-31801: add version added for _ignore_

* Remove Setup.config
* Always define WITH_THREAD for compatibility.

* bpo-30616: Functional API of enum allows to create empty enums.

* Update NEWS

move addition to avoid conflict