MIDEAST STOCKS-Egypt rises in post-devaluation rally; Gulf falls with oil

* Egyptian shares rise a second day after devaluation * But trading volume almost halves * Real estate gains, exporters strong * Broad sell-off in Saudi stocks * Ex-dividend FGB is main drag on Abu Dhabi By Celine Aswad DUBAI, March 15 (Reuters) - Egypt's stock market rose for a second straight day on Tuesday after the country's central bank devalued the currency. Gulf markets fell as oil prices retreated. Cairo's index climbed 1.9 percent to 7,140 points, rising above technical resistance at th