Rl

-----------------

- Rework the history interface: Implement iteration and remove redundant APIs.
[stefan]

- History stifling could cause duplicate history entries.
[stefan]

- Make sure ``begidx`` and ``endidx`` completion variables are reset to 0.
[stefan]

----------------

- Remove unused defines; we don't support libedit or readline < 5.0.
[stefan]

- Improve performance of ``get_current_history_length``.
[stefan]

----------------

- Make ``get_history_item`` zero-based and remove ``get_history_base``.
[stefan]

----------------

- Support installation into MacPython for Mac OS X.
[stefan]

----------------

- The history size can now be limited ("stifled") by setting
``history.max_entries``. This supersedes ``history.length`` which has been
removed.
[stefan]

- Close a memory leak in ``get_current_history_length``. Also see Python
`issue 8065`_.
[stefan]

.. _`issue 8065`: https://bugs.python.org/issue8065

------------------

- Avoid segfaults during codec lookup by calling ``PyGILState_Ensure`` in all
the right places. Fixes rl `issue/5`_. Removes the workaround introduced in
1.5.2.
[stefan]