A quiet month in the merger and acquisition area for publicly-owned wine companies, with Constellation being the only outfit to show up at the checkout counter with purchases in its shopping cart. Wine-related stocks continue to do well, with our Wine Market Index up 1/10 of 1% in the past month. How is that good? Well, compare it to the Nasdaq, which dropped over 14% in March, or to the Dow, which began accelerating its decline with a decrease of nearly 6% over the past 30 days.Constellation Br...