A Thing Of BeautyA Thing Of Beauty Its a wonder to behold what happens when love moves in . . . Former child star Fiona Hume deserted the movie biz a decade agoright after she left rehab. She landed in Baltimore, bought a dilapidated old mansion downtown, and hatched dreams of restoring it into a masterpiece, complete with a studio for herself. She would disappear from public view and live an artists life. That was the plan. Ten years later, Fionas huge house is