Various improvements #17
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By writing the Count() function in C, we speed things up by about 50%. It should actually be a lot more than 50%, but I can't convince cgo to use SSE2 at the moment. In any case, 50% is significant enough.
I fixed a bug in NextSet.
I have added cardinality functions. Given two bitset, you can now compute the cardinality (Count) of their intersections without having to materialize the answer. (Great potential speed boost.)