GUEST COLUMN from TERRY BERKSON Whistling Woodchucks! Back Again Not that they ever left. They just take a long winter nap while their heartbeat slows from 80 to an incredible five beats per minute and their body temperature drops from 99 to 37 degrees. Punxsutawney Phil projects a good productive image with his weather predictions but Digger Dan, the name I give to the critter whose been tunneling into my barn every year, is another story. One morning last spring,…