New powny kernel/userspace

PS: Tests failed because the new version of requests/vcrpy contains a bug: https://github.com/kevin1024/vcrpy/issues/94
https://docs.python.org/3.4/reference/datamodel.html#object.__exit__
> If an exception is supplied, and the method wishes to suppress the exception (i.e., prevent it from being propagated), it should return a true value. Otherwise, the exception will be processed normally upon exit from this method.