German carmaker Daimler has marked a definitive separation from Chrysler by making a deal to give up its 19.9 percent stake in the US firm and forgiving its outstanding loans, the company has said.   Under the deal, Daimler has also agreed to three annual payments of $200 million (£137 million) into Chrysler's pension plans.   "In this way, Daimler is helping to secure pension payments to former employees of DaimlerChrysler," it said in a statement.