Associated Press: The Gulf of Mexico oil spill has brought out thousands of people who just want to help — though there isn’t much for them to do unless they own a Hazmat suit. Directors of charities and BP PLC — the company responsible for cleaning up the spill unleashed after the Deepwater Horizon drilling rig exploded April 20 — say the outpouring has been huge among people with vivid memories of Hurricane Katrina five years ago. However, cleaning oiled birds and tar-stained beaches isn’t …