Berlin (dpa) - German Chancellor Angela Merkel fought Friday against a possible rebellion in her government's ranks over a new bailout for Athens, warning of a catastrophe for cash-strapped Greece if a new aid deal is not struck. Greece could be gripped by "chaos and violence," Merkel told parliament as she urged German lawmakers to back the opening of talks with Athens on a new 86-billion-euro (94-billion-dollar) lifeline for the eurozone's most indebted