For the first time in 30 years McDonald’s Corp. is changing its conventional cuppa hoping a stronger, richer blend will boost breakfast sales and better arm the burger giant in the ever hotter battle for coffee drinkers. To reinforce its premium name the new roast comes in a new paper-covered styrofoam cup and black lid. The change follows similar steps taken by Dunkin’ Donuts, Starbucks and Burger King some years ago: Americans want a richer cup and…(att.1)