general cleanup items for containers
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move some HashTable details into the Detail namespace
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avoid delete/new when calling HashSet::set()
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better handling of pointers in hashes (IO).
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FixedList output formatting influences pair/edge and thus we get things like
2{100}for a labelPair output. For these short lists it probably doesn't have much space saving. It would be nice to have the same output format for a Pair or a Tuple2 of the same content.