TRI CITY -- President Ronald Reagan was in his first term of office and John Elway was still playing quarterback at Stanford the last time South Umpqua High School advanced in the state football playoffs.The year was 1981, and the Lancers played Siuslaw to a scoreless tie in the Class AA state title game, according to OSAA records. Zipping ahead in time to this Friday, South Umpqua (7-3) will try to get into the state playoff history books again when the Lancers travel to Eugene to play No. 2-ranked Marist (9-0) at 7 p.m. in the second round of the …