WASHINGTON (Reuters) - President Bush is likely to raise U.S. concerns about China's currency policies when he meets at a summit in Chile with Chinese President Hu Jintao, a senior U.S. official said on Wednesday. "He's had a consistent practice of raising this," the official said, calling the currency issue "a matter of concern for us." The official repeated Treasury Secretary John Snow's message to the Chinese that "we believe the best economic systems are those that operate under the terms of free trade, free exchange rates and free movement of capital," the official said. The United States wants China...