U.S.-JAPAN TRADE. . . ACCENTUATE THE POSITIVE

President Clinton and Japanese Prime Minister Tomiichi Murayama ended a quick Washington summit today by plugging the upbeat side of current U.S.-Japanese relations: joint support of the North Korean nuclear pact and the mini-breakthrough to allow U.S. apples onto Japanese shelves. The little-mentioned downside: The U.S. trade gap with Japan has grown, Clinton admitted, and "further progress must be made" to open Japan's markets to U.S. autos and auto parts, which account for nearly 60 percent of the deficit.