A week of bitterly cold nights has driven record numbers of Roseburg’s homeless to seek shelter at nighttime warming centers this week. Two centers operated by the Douglas County Housing and Homeless Coalition have been open each of the past seven nights. It is the longest number of consecutive nights the shelter at Unity Church on Winchester Street in Roseburg has been open since the coalition began operating it last year, said shelter coordinator Ian Smith. “A week or so ago, I was thinking we were having a slow season because we had only been open two nights,” Smith said. …