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- there were previously no hashing mechanisms for lists so they would fall back to the definition for primitives and hash the memory location of the allocated List object. - provide a UList::Hash<> sub-class for inheritance, and also a global specialization for UList<T>, List<T> such that the hash value for List<List<T>> cascades properly. - provide similar function in triFace to ensure that it remains similar in behaviour to face. - added SymmHash to Pair, for use when order is unimportant. STYLE: use string::hash() more consistently - no particular reason to use Hash<word>() which forwards to string::hash() anyhow