SEASON PREMIERE: For Season 5, Portlandia is going forward by retreating into the past. Specifically, it’s providing stand-alone episodes that qualify as mini-movies, giving a backstory for the various characters played by series chameleons Fred Armisen and Carrie Brownstein. Tonight, to open this new season and new approach, Portlandia dips into the past of Candace and Toni, those steely-faced feminists who run the Women and Women First bookstore. What do we find there? That they once worked, and struggled, in the corporate world.