- relocated HashSetPlusEqOp and HashTablePlusEqOp to
HashSetOps::plusEqOp and HashTableOps::plusEqOp, respectively
- additional functions for converting between a labelHashSet
and a PackedBoolList or List<bool>:
From lists selections to labelHashSet indices:
HashSetOps::used(const PackedBoolList&);
HashSetOps::used(const UList<bool>&);
From labelHashSet to list forms:
PackedBoolList bitset(const labelHashSet&);
List<bool> bools(const labelHashSet&);
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