Converted to PERMIT_PACKAGE and added MODPY_PYTEST ok sthen@
we expected and it's easier|safer to do it this way than fiddle with pkg_add now. thanks aja for update tests with a quick bulk.
Atomic file writes for Python: * Race-free assertion that the target file doesn't yet exist. * Simple high-level API that wraps a very flexible class-based API. * Consistent error handling across platforms.