set the timezone to UTC on cloning a freenet repo to avoid timezone-based attacks. | owner:Arne Babenhauserheide <bab@draketo.de>, open:True, id:4dfc4cc28a7fa69f040776a7138da78ee89ec819, time:1355764180.36 mime-type problems | owner:Arne Babenhauserheide <bab@draketo.de>, open:False, id:5916e6e8328e20d8b0276b76b7116dd432730778, time:1353463866.97