Setuptools

====

* Off-project PR: `0dcee79 <https://github.com/pypa/setuptools/commit/0dcee791dfdcfacddaaec79b29f30a347a147413>`_ and `f9bd9b9 <https://github.com/pypa/setuptools/commit/f9bd9b9f5df54ef5a0bf8d16c3a889ab8c640580>`_
For FreeBSD, also `honor root certificates from ca_root_nss <https://github.com/pypa/setuptools/commit/3ae46c30225eb46e1f5aada1a19e88b79f04dc72>`_.

======

* Issue 491: Correct regression incurred in 19.4 where
a double-namespace package installed using pip would
cause a TypeError.

======

* Restore compatibility for PyPy 3 compatibility lost in
19.4.1 addressing Issue 487.
* ``setuptools.launch`` shim now loads scripts in a new
namespace, avoiding getting relative imports from
the setuptools package on Python 2.

====

* Added a new entry script ``setuptools.launch``,
implementing the shim found in
``pip.util.setuptools_build``. Use this command to launch
distutils-only packages under setuptools in the same way that
pip does, causing the setuptools monkeypatching of distutils
to be invoked prior to invoking a script. Useful for debugging
or otherwise installing a distutils-only package under
setuptools when pip isn't available or otherwise does not
expose the desired functionality. For example::

$ python -m setuptools.launch setup.py develop

* Issue 488: Fix dual manifestation of Extension class in
extension packages installed as dependencies when Cython
is present.

====

* Issue 486: Correct TypeError when getfilesystemencoding
returns None.
* Issue 139: Clarified the license as MIT.
* BB Pull Request 169: Removed special handling of command
spec in scripts for Jython.

======

* Issue 487: Use direct invocation of ``importlib.machinery``
in ``pkg_resources`` to avoid missing detection on relevant
platforms.