It is fitting in more ways than one that Ted Koppel devotes the final program in his 26-year reign on ABC's "Nightline" to the charming sociology professor who died from Lou Gehrig's disease and inspired Mitch Albom's "Tuesdays with Morrie." The three 1995 "Nightline" shows in which Koppel talked with Morrie Schwartz about living life and coping with death were among the most memorable of his 6,500 programs. Additionally, his last show, which airs at 11:35 tonight on Channel 7, will show "Nightline" fans what they will be missing with Koppel's departure: The time to devote to one captivating story...