GLOBAL MARKETS-Respite for commodities as dollar wilts, China bounces

* Brent oil stabilises above $50 a barrel after 5 pct drop * Subdued day for European bourses, Wall Street seen down 0.2 pct * Dollar softer after weak data, focus now on payrolls * China stocks bounce 3 pct, copper and other commodities firmer * Aussie rises after RBA tones down currency strength concerns By Marc Jones LONDON, Aug 4 (Reuters) - Investors got a day off from commodity market turmoil on Tuesday, as oil prices steadied at $50 a barrel after a 5 percent drop