Home Bound"When I was growing up, I learned that if you were a girl you went to school and college, then you married, became a wife and had a family. . . . When I became disabled, my journey, I was pretty sure, was not going to take me in those directions. What was I supposed to be? What kind of life was I supposed to have?"Once polio had made her a quadriplegic, Cass Irvin didn't know where she fit in or what would become of her. Neither did her parents,