By Jonathan Landay WASHINGTON (Reuters) -France, Germany, Britain and the United States on Thursday condemned an increase by Iran in the production rate of highly enriched uranium of up to 60% purity, close to the level used for nuclear weapons fuel. In a joint statement, the allies made no mention of any consequences Iran could face for the production hike but called for its reversal and said they remained “committed to a diplomatic solution” of the feud over Tehran’s nuclear program. “The production of high-enriched uranium by Iran has no credible civilian justification,” the statement said….