LONDON (Reuters) - Glencore said its 2019 copper output fell 6% and battery mineral cobalt rose 10% as it boosted production at its Katanga mine in the Democratic Republic of Congo, offsetting the impact of the early closure of another operation.The news drove Glencore's shares 5% higher by 1000 GMT, outperforming London peers, as analysts took the view Glencore was overcoming operational problems in Africa. The miner shut its Mutanda mine in Congo ahead of schedule in November in response to..