WASHINGTON (AP) - The government is considering whether a drug for a serious chronic condition - high cholesterol - should sit on drugstore shelves alongside medicines for headaches, allergies and athlete's foot. Supporters say making a low-dose cholesterol medicine available without a doctor's prescription would help get needed treatment to millions of Americans who are at risk of heart disease. "There's a huge treatment gap," said Jerry Hansen, vice president of marketing at Johnson & Johnson-Merck Consumer Pharmaceuticals Co., a joint venture that is asking the Food and Drug Administration for permission to sell a low-dose version of Mevacor over...