Theft puts life on hold BY SARAH DAVIDSON AVALANCHE-JOURNAL $450. Pocket change to some. But for Robert McDonald, it means months of scrimping and saving. And losing his independence. Thursday morning, the 49-year-old Lubbock man noticed his red '98 Huffy bike was missing from his back porch. The replacement cost: about $450. Money he doesn't have. McDonald has dystonia, a neurological movement disorder. Unable to drive, he depends on public transportation for some travel. But his three-wheeled bicycle, complete with a large hauling basket, was his lifeline for chores associated with living independently. "He doesn't like to ask for help;...