By Philip Pullella and Anna Mehler Paperny EDMONTON, Alberta (Reuters) -Pope Francis landed in Canada on Sunday to kick off a five-day trip that will center around his apology on behalf of the Roman Catholic Church for the abuse that indigenous children endured at mostly church-run residential schools. “This is a trip of penance. Let’s say that is its spirit,” the pope told reporters in his traditional comments after his flight took off from Rome. He touched down in Edmonton in the western province of Alberta, where he will visit a former residential school and meet with indigenous peoples on …