Requirements on parallel_do body

Class `Body` implementing the concept of parallel_do body must define:

- B::operator()(
  cv_item_type item,
  parallel_do_feeder<item_type>& feeder
  ) const
  OR
  B::operator()( cv_item_type& item ) const
  Process item. May be invoked concurrently for the same `this` but different `item`.
- item_type( const item_type& )
  Copy a work item.
- ~item_type()
  Destroy a work item

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