GLOBAL MARKETS-Stocks head for weekly loss on U.S. shutdown; dollar near lows

* Dollar edges higher, but not far off eight-month low * Wall Street, Europe shares higher but sentiment fragile * U.S. new-year CDS hits highest since August 2011 By Wanfeng Zhou NEW YORK, Oct 4 (Reuters) - Major stock markets edged higher on Friday but were headed for a second week of losses while the dollar hovered near an eight-month low on fears the budget standoff in Washington will drag on until politicians reach a deal to raise the U.S. debt ceiling. On Wall Street,