AP: The head of the agency overseeing offshore drilling at the time of the BP oil spill says she deeply regrets that the accident occurred when she was in charge. The comments Wednesday at a hearing of the presidential commission investigating the spill are the first from Elizabeth Birnbaum since she resigned under pressure from her position in May. She headed the Minerals Management Service for 10 months, and was replaced by a former federal prosecutor, Michael R. Brownwich, in …