Like trading docksiders and chinos for flip flops and board shorts, Bostwick's, which held court on Three Mile Harbor for years as a favorite local haunt, has slimmed down and moved south down to the Highway, becoming Bostwick's Chowder House in the space formerly occupied by its sibling, Cherrystones -- though the flip is sort of a combination of the two, with some of Bostwick's favorite menu...