* Dubai's Emaar reveals strong demand for Malls unit IPO * Retail investors cash out again to participate * Saudi's Savola rises after hiring bank for potential acquisition * Egypt rises on successful $8.5 bln Suez Canal fund-raising * Deal shows renewed confidence in eco**my By Olzhas Auyezov DUBAI, Sept 16 (Reuters) - A rush by Dubai's retail investors to take part in the initial public offer of Emaar Properties' Malls unit put pressure on the emirate's stock market on Tuesday, while successful fund-raising for the Suez Canal expansion lifted stocks in Egypt. ...