- Issue #16662: load_tests() is now unconditionally run when it is present in
  a package's __init__.py.  TestLoader.loadTestsFromModule() still accepts
  use_load_tests, but it is deprecated and ignored.  A new keyword-only
  attribute `pattern` is added and documented.  Patch given by Robert Collins,
  tweaked by Barry Warsaw.
A few tweaks for issue16662 based on feedback from Robert Collins.