MINISERIES PREMIERE: This three-part miniseries, with Ridley Scott as one of its executive producers, takes place in 1897, following the fervent fever generated by the hope of instant riches in the turn-of-the-century gold rush days. It’s set in Dawson City, though most of the good-looking characters look like residents of Dawson’s Creek. This is Discovery’s first scripted drama, though, so it’s going for sizzle as well as scale, and hoping to succeed with a story that wi