[issue17834] Add Heap (and DynamicHeap) classes to heapq module

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +rhettinger
stage:  -> patch review
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17834>
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