Add __name__ and __doc__ to __slots__

__slot__ => __slots__

* Negative integer support in binary plists was broken

* Better exception for invalid data

* Fix the versionadded/versionchanged markup in the documentation

* Add the interface cleanup to what's new for 3.4

and return converter from existing functions.

When dict got clinicized in 8fde1a2c94dc for Issue #16612 an erroneous
trailing quote was left in the clinic docstring summary line.

illegal attribute name.  Found by INADA Naoki.

Patch from Andrew Barnert.