Ailing right-hander John Maine might be shut down for the season if Jerry Manuel and the Mets don't like what they see from Maine's shoulder in a throwing session this week, Manuel told reporters today. Maine, who has a bone spur in his shoulder, is coming off his worst start in almost a year Saturday night, when he gave up eight earned runs in 7 2/3 innings of an 8-3 home loss to the Astros. Maine told The Post after the game that he planned to have the bone spur removed by...