[issue1175004] Export more libreadline API functions

[Ned Deily]

Ned Deily <nad at acm.org> added the comment:

Issue1744456 contains a different patch to implement readline callbacks.  Suggest that anyone moving forward with this review both patches.

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nosy: +ned.deily

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1175004>
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