AFP: More than half the oil released from a busted BP well remains in the Gulf of Mexico, a presidential panel was told Monday, as the US pointman lamented a “dysfunctional” response to the disaster. Interior Secretary Ken Salazar meanwhile told the bipartisan commission that the spill had bolstered a drive to reform federal regulations for offshore drilling, promising that lessons were learnt. In an ominous sign for Gulf residents, however, oceanographer Ian MacDonald told the …