* Euro at two-year low as Draghi wins battle against ECB hawks* European stocks jump 1 percent, Wall Street starts flat* Dollar regains traction, commodities remain under pressureBy Marc JonesLONDON, Nov 6 (Reuters) - The euro slumped to a two-year low and shares jumped on Thursday after ECB chief Mario Draghi fended off complaints about his leadership style and firmed up a promise of 1 trillion e