Requirements on iterators for parallel_sort

Requirements on the iterator type `It` and its value type `T` for `parallel_sort:`

- void iter_swap( It a, It b )
  Swaps the values of the elements the given iterators `a` and `b` are pointing to. `It` should be a random access iterator.
- bool Compare::operator()( const T& x, const T& y )
  True if x comes before y;

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