message: Added move for copy elison in Dataset_Index (OSX)
diff: @@ -547,7 +547,7 @@ guess_info(const Feature & feat) const
  if (debug) cerr << "result now " << result << endl;
  - return result;
  + return std::move(result);
  }
  Feature_Info Dataset_Index::
  @@ -586,7 +586,7 @@ guess_info_categorical(const Feature & feat) const
  else result.set_type(REAL);
  }
  - return result;
  + return std::move(result);
  }
  