MIDEAST STOCKS-Saudi edges up in volatile trade as oil recovers, Egypt hits record

* Saudi index near six-week low * Banks, petrochemicals rebound * Dubai soft but ends week with gains * Abu Dhabi swings, supported by banks * Arabian Cement continues surge in Egypt By Celine Aswad DUBAI, Jan 12 (Reuters) - Saudi Arabia's stock market edged higher in volatile trade on Thursday but suffered its worst weekly decline since September, while Egypt extended its bull run as international funds accumulated shares. The Saudi index closed 0.4 percent higher at 6,922 points; it remains ne