BERLIN (Reuters) - Investors do not expect a speedy recovery from current weak developments in the German economy, the ZEW research institute said on Tuesday, adding that its monthly survey pointed to a subdued third quarter. Citing recent data on industrial production, retail sales and foreign trade, the survey showed economic sentiment among investors in Europe's biggest economy rising slightly to -24.1 in November from -24.7 in October. That compared with a Reuters consensus forecast of..