[boost] [Algorithm] [Range] `is_sorted` is duplicate

Both Boost.Algorithm and Boost.Range have `is_sorted` function. Would it be better to deprecate Boost.Range's `is_sorted`? Also, Both Boost.Algorithm and Boost.Range have `iota` function. (In this case, Boost.Algorithm's `iota` returns void, but Boost.Range's `iota` returns the range.) Regards, Michel