By MarketsFarm WINNIPEG, May 15 (MarketsFarm) – The Canadian dollar was virtually unchanged on Friday, after it fluctuated across both sides of 71 U.S. cents. The dollar was supported by gains in crude oil, but growing uncertainty in United States/China trade relations weighed on values. The loonie finished the day at US$0.7095 or US$1=C$1.4094, compared