initialization. If the interpreter is shut down and reinitialized (embedded
CPython), the old module dictionary was not dec-refed during the next import of
the time extension module.

Contributed by Torsten Marek of Google.

(this should fix some buildbot test failures)

Patch by Serhiy Storchaka.

#16306: Fix multiple error messages when unknown command line parameters where passed to the interpreter.  Patch by Hieu Nguyen.

Patch by Serhiy Storchaka.

Issue #15379: Fix passing of non-BMP characters as integers for the charmap decoder (already working as unicode strings).
Patch by Serhiy Storchaka.

Remove versionadded from the tutorial, at a location where it produces more questions than it answers.

Also add tests for hashing.