Implement bitmap-concise #9
Description
See basic java implementation https://github.com/metamx/extendedset.git and http://ricerca.mat.uniroma3.it/users/colanton/docs/concise.pdf
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See basic java implementation https://github.com/metamx/extendedset.git and http://ricerca.mat.uniroma3.it/users/colanton/docs/concise.pdf