fix incorrect rounding of exposure duration when loading dark lib. Fixes #743
fix incorrect rounding of exposure duration when loading dark lib. Fixes #743

OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2