- Change all remaining assertions into verify() and vereq() calls.
- Change all remaining assertions into verify() and vereq() calls.

- Add tests for the recent fixes to copy_reg.py:
  __getstate__/__setstate__ and mixed inheritance from new+classic
  classes.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator