A Boston hospital has agreed to settle a gender bias lawsuit by paying its former head of anesthesiology $7 million, lawyers said. The settlement between Beth Israel Deaconess Medical Center and Dr. Carol Warfield includes some non-financial items. Warfield, now 61, charged that Dr. Josef Fischer, who was then head of surgery, systematically sabotaged her and tried to have her removed after she became head of anesthesiology in 2000. She complained to Paul Levy, then the hospital's chief executive, and said he allied with Fischer to force her out of her position.