Northern Spain gets chilly from December to March. Sure, it’s not Berlin, but there is snow on the Pyrenees and the good people of Barcelona are wearing their most stylish winter coats. In northeastern Spain, Catalonia is gushing with hot spots where water, wine and relaxation promise to cure whatever ails you and warm up frosty fingers. Soaking it up in hot springs is nothing new in the region, and many current balnearis and spas …