Stock index futures seen inching lower

(Reuters) Stock index futures pointed to a lower open on Wall Street on Wednesday, with futures for the S&P 500, Dow Jones futures and Nasdaq 100 futures down 0.04 to 0.2 percent at 0901 GMT. * On the macro economic front, investors will watch U.S. Redbook weekly U.S. Retail Sales at 1355 GMT. * Iran has threatened to halt the flow of oil through the Strait of Hormuz if foreign sanctions were imposed on its crude exports over its nuclear ambitions, in a move which some analysts say could kindle military conflict with economies dependent on Gulf Oil. ...