Datrie

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There are no new features or speed improvements in this release.

* ``datrie.new`` is deprecated; use ``datrie.Trie`` with the same arguments;
* small test & benchmark improvements.

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* ``datrie.Trie`` items can have any Python object as a value
(``Trie`` from 0.1.x becomes ``datrie.BaseTrie``);
* ``longest_prefix`` and ``longest_prefix_items`` are fixed;
* ``save`` & ``load`` are rewritten;
* ``setdefault`` method.

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* Windows support (upstream libdatrie changes are merged);
* license is changed from LGPL v3 to LGPL v2.1 to match the libdatrie license.

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Initial release.