The U.S. restaurant industry is putting up a great show amid price pressures. Sales are soaring as an increasing number of Americans are spending freely on dining out.According to the Commerce Department, sales at U.S. food and drinking places totaled $98.1 billion in March, up 0.4% month over month after increasing 0.5% in February. Sales at U.S. restaurants rose a solid 6.6% year over year in March, while sales from January through March totaled $27.1 billion.The retail sector has struggled for months owi ...