ABU DHABI (AFP) - Coordination between members of oil-exporting cartel OPEC and non-member producers is "vital" to rebalance the market, OPEC chief Mohammad Barkindo said Monday. Former OPEC Secretary General HE Abdalla Salem El-Badri (right) handing over the executive leadership of the OPEC Secretariat to newly appointed Secretary General HE Mohammad Sanusi Barkindo. (OPEC homepage)"We believe it is vital that both OPEC and non-OPEC countries come together and take coordinated... action to reba