Release v0.8.2

Minor bugfix release. There are minor changes in the cmake script to aid building in Windows (thanks to @massarom)

Fixed

• Cell.get_paths not returning all FlexPaths when RobustPaths were present in the cell (thanks @jatoben)
• Reference array is no longer transformed into multiple references when element displacement is zero
• Memory leaks in the python wrapper (thanks @jatoben)

Changed

• Set separation instead of offset in FlexPath::init and RobustPath::init