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brie-tree - SIMD-optimized B+ Tree implementation that uses integer keys

A fast B+ Tree implementation that uses integer keys.
The API is similar to the standard library's BTreeMap with some significant differences:

* Lookups and insertions are 2-4x faster than BTreeMap.
* BTree can optionally be used as a multi-map and hold duplicate keys.
* Keys must be integer types or convertible to integers via the BTreeKey trait.
* The maximum integer value is reserved for internal use and cannot be used by keys.
* Elements in the tree are ordered by the integer value of the key instead of the Ord implementation of the keys.
* Cursors can be used to seek back-and-forth in the tree while inserting or removing elements.
* Iterators only support forward iteration.