GLOBAL MARKETS-Stocks head for weekly loss, dollar hovers at 8-month low

* Dollar rebounds, but not far off eight-month low * Wall Street, Europe shares rise but budget, debt fears persist * U.S. one-month T-bill rates hover at highest in 10 months 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 W