By Mohamed Ghobari and Ahmed Tolba ADEN (Reuters) -Yemen’s president delegated power to a presidential council and dismissed his deputy on Thursday as Saudi Arabia moved to strengthen an anti-Houthi alliance amid U.N.-led efforts to revive negotiations to end the seven-year war. Riyadh announced $3 billion in financial aid to the Saudi-backed government after the announcement by President Abd-Rabbu Mansour Hadi. It called for talks with the Houthis who control the north and have been battling the Saudi-led coalition. Yemen’s warring sides, in a major breakthrough, had agreed on a two-month tru…