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ENH: improvements to labelRange const_iterator
Mark Olesen authored 
- inherit from std::iterator to obtain the full STL typedefs, meaning
  that std::distance works and the following is now possible:

      labelRange range(100, 1500);
      scalarList list(range.begin(), range.end());

  --
  Note that this does not work (mismatched data-types):

      scalarList list = identity(12345);

  But this does, since the *iter promotes label to scalar:

      labelList ident = identity(12345);
      scalarList list(ident.begin(), ident.end());

  It is however more than slightly wasteful to create a labelList
  just for initializing a scalarList. An alternative could be a
  a labelRange for the same purpose.

      labelRange ident = labelRange::identity(12345);
      scalarList list(ident.begin(), ident.end());

  Or this
      scalarList list
      (
          labelRange::null.begin(),
          labelRange::identity(12345).end()
      );
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