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New Features:
* The default of the ``mod_path`` argument to ``init`` is now ``True``. If a
deletion is performed then the deleted ``sys.path[0]`` entry is saved as
``set_package_attribute.deleted_sys_path_0_value`` for informational
purposes, replacing its default ``None`` value.
* A shortcut import ``set_package_attribute_magic`` was added which automatically
calls ``init`` with the default argument values.