AFP: The number of US Gulf coast residents who say they suffer from depression rose by more than 25 percent following the catastrophic BP oil spill that sullied their shorelines and devastated their livelihoods, a Gallup poll showed Tuesday. Pollsters said inhabitants of Gulf coast areas who said they had a clinical diagnosis of depression increased by four points — a 25.6 percent jump — in the 15 weeks after the April 20 Deepwater Horizon explosion and subsequent oil spill, compared to …