Setuptools

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Changes
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* 2089: Package index functionality no longer attempts to remove an md5 fragment from the index URL. This functionality, added for distribute 163 is no longer relevant.

Misc
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* 2041: Preserve file modes during pkg files copying, but clear read only flag for target afterwards.
* 2105: Filter ``2to3`` deprecation warnings from ``TestDevelop.test_2to3_user_mode``.

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Changes
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* 2040: Deprecated the ``bdist_wininst`` command. Binary packages should be built as wheels instead.
* 2062: Change 'Mac OS X' to 'macOS' in code.
* 2075: Stop recognizing files ending with ``.dist-info`` as distribution metadata.
* 2086: Deprecate 'use_2to3' functionality. Packagers are encouraged to use single-source solutions or build tool chains to manage conversions outside of setuptools.

Documentation changes
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* 1698: Added documentation for ``build_meta`` (a bare minimum, not completed).

Misc
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* 2082: Filter ``lib2to3`` ``PendingDeprecationWarning`` and ``DeprecationWarning`` in tests,
because ``lib2to3`` is `deprecated in Python 3.9 <https://bugs.python.org/issue40360>`_.

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No significant changes.

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Misc
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* 1458: Added template for reporting Python 2 incompatibilities.

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No significant changes.

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Changes
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* 308: Allow version number normalization to be bypassed by wrapping in a 'setuptools.sic()' call.
* 1424: Prevent keeping files mode for package_data build. It may break a build if user's package data has read only flag.
* 1431: In ``easy_install.check_site_dir``, ensure the installation directory exists.
* 1563: In ``pkg_resources`` prefer ``find_spec`` (PEP 451) to ``find_module``.