CALGARY, Alberta (Reuters) - A top Canadian official sought to calm an international uproar over hundreds of ducks killed at Canada's biggest oil sands plant by promising, at a U.S. oil industry event on Monday, that the incident will not go unpunished. The deaths of 500 ducks last week on a Syncrude Canada Ltd wastewater pond was unacceptable, Industry Minister Jim Prentice said during an acceptance speech after Canada was named "Country of the Year" by Energy Magazine. "We anticipate those responsible will face full scrutiny under Canadian law and, insofar as the government of Canada is concerned, there will...