MIDEAST STOCKS-Egypt surges for fourth day, oil boosts Gulf

* Euphoria over devaluation lifts Egypt 14 pct this week * EFG Hermes soars on Credit Libanais stake sale * Zain Saudi jumps after Reuters report on possible tower sale * Abu Dhabi's index buoyed by new dividend policy * Heavy trade in Etisalat before FTSE index inclusion By Andrew Torchia DUBAI, March 17 (Reuters) - Egypt's stock market rose sharply for a fourth straight day on Thursday as investors welcomed this week's currency devaluation, while higher oil prices boosted Gulf markets. The Cai