libcollections: Add a Multiset data structure.#15623

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nham wants to merge 13 commits intorust-lang:masterfrom

Commits on Jul 12, 2014

Commits on Jul 13, 2014

Change TreeMultiset len() to return the number of occurrences. The previous version returned the number of distinct values.
nham
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Commits on Jul 14, 2014

Commits on Jul 16, 2014

Commits on Jul 22, 2014

Commits on Jul 31, 2014

Inline a bunch of methods. Change one 0u -> 0
nham
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