FOR FRIDAY M.E. Retailers are anticipating what one industry group says is an extremely positive picture for holiday sales. Today, of course, is traditionally the busiest shopping day of the year. For retailers it's the start of the all-important christmas shopping season. Minnesota Pubic Radio's Bill Catlin reports. SFX, INTERIOR HUBBUB Just before opening time earlier this week, a crowd of shoppers quickly swells to fill a hallway at one entrance to t