By Philip Pullella VATICAN CITY (Reuters) – Pope Francis on Thursday denounced psychological violence and abuse of power in the Church, as the case of a prominent priest accused of exploiting his authority to sexually abuse nuns has rocked the Vatican. The 86-year-old pope made his comments in his annual Christmas address to cardinals, bishops and other members of the Curia, the central administration of the Vatican. Francis has often used the occasion to decry perceived flaws in the top bureaucracy, such as gossip, cliques and infighting. After mentioning wars, the pope said: “Besides the vio…