As part of its attempt to dig out from under a wave of bad publicity and accusations of fiscal irresponsibility, the Saratoga Performing Arts Center (SPAC) is junking its entire board and starting fresh. The board unanimously resigned last week, and the new roster includes only four members with previous SPAC board experience. SPAC came under fire last year after dropping New York City Ballet from its summer schedule, and was subsequently the subject of a scathing audit which accused the board of willful mismanagement.