v10.3.1

• #610: Ensure __init__ can be used when user implements __new__.

  Version 10.3 dropped support for calling __init__, but that breaks
  a number of popular projects. Reintroduce the ability to use __init__
  when a class or one of its super classes contains a user implemenentation
  of __new__.

  Code relying on the __new__ provided by PyObjC still cannot use
  __init__ for the reason explained in the 10.3 release notes.