Kirsty Coventry, elected last March as the first female president of the International Olympic Committee , touts the Milan Cortina Winter Games that officially open Friday as “the most gender-balanced in history.” That’s reflected in, and helped by, changes on the schedule over the coming weeks. A women’s doubles event was added to luge. A women’s large hill individual event appears in ski jumping for the first time at an Olympics. Ski mountaineering — the lone sport making its Games debut in