[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

Suggestions from Antoine on python-dev:

* do not make cOrderedDict "builtin"; drop changes to:
  - Include/Python.h
  - Objects/object.c
  - Makefile.pre.in
* do not add a C-API
* include the linked list pointers in the hash entries? (may simplify things)
* drop the shared/split keys mechanism?
* do not subclass dict? (can of worms)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16991>
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