MILAN, Feb 3 : Sebastian Samuelsson has been working up a sweat as he seeks to fill the void left by the retirement of Norwegian Johannes Thingnes Boe, raising his temperature to try to create an advantage he hopes will make him the best in the field at Milano Cortina.  Taking part in his third Olympics, the 28-year-old Swede has been piling on the layers ahead of hour-long workouts, shedding up to three litres of sweat each time in preparation for the Games.  “It’s a way to increase blood