Digital remastering - the final frontier. My friends on the Internet have been looking forward all summer to this: the Sci-Fi Channel has completely remastered the original NBC series "Star Trek" and begins airing the pristine remakes at 6:30 weeknights beginning tonight. Also tonight, a repeat of Karin Muller's (above, left) gutsy camcorder chronicle, "Hitchhiking Vietnam," at 9 on Channel 19.

