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PERF: upgrade khash lib to 0.2.8#8547

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Commits on Oct 30, 2014

• * khash.h: move custom hash map definitions into khash_python.h

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• khash.pxd: remove kh_del

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• khash.h: sync with 0.2.8 upstream release

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• Add factorization vb suite

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• Move PANDAS_INLINE detection outside to khash_python.h

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• Add short str test

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• drop khuint64_t

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• Change str hash function to xxhash

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• Reorganize factorization benchmarks to speed up initialization

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• Add hashtable for C buffer type (ptr + len) avoiding strlen overhead

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