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* Issue 341: Correct error in path handling of package data
files in ``build_py`` command when package is empty.
* Distribute 323, Issue 141, Issue 207, and
BB Pull Request 167: Another implementation of
``pkg_resources.WorkingSet`` and ``pkg_resources.Distribution``
that supports replacing an extant package with a new one,
allowing for setup_requires dependencies to supersede installed
packages for the session.