The industrial giant's prospects are improving, but questions around its dividend and strategic direction remain.Shares in 3M (MMM -1.25%) rose by a market-busting 15.1% in March, according to data provided by S&P Global Market Intelligence. The move came in a period of relatively positive news flow for the company.3M's good news month3M investors have grown accustomed to receiving disappointing news from the company, whether it's ongoing legal issues, disappointing sales growth, or declining margin perform ...