MUNICH (Reuters) - Germany's Siemens on Wednesday reported weaker-than-expected industrial profit during its first quarter as a downturn in the manufacturing sector hit its flagship digital industries business and its wind power unit suffered losses.Chief Executive Joe Kaeser described a slow start to the year as Siemens's industrial operating profit fell 30% to 1.43 billion euros (£1.2 billion), missing analyst forecasts for 1.88 billion euros in a consensus gathered by the company.Revenue..