undecoded UTF-8 bytes as a string when accessing the Tk clipboard.
Modify clipboad_get() to first request type UTF8_STRING when no
specific type is requested in an X11 windowing environment, falling
back to the current default type STRING if that fails.
Original patch by Thomas Kluyver.

This patch also clarifies the definition of Naive and Aware.

Original patch by Greg Weller, I modified the first hunk
somewhat to make the exposition even clearer (I hope).

Patch by Hynek.

support chflag operations.  (Patch by Hynek Schlawack)

Patch by Hynek Schlawack.

associated pwd entry.

In multiprocessing, a pool worker process would die
if the result/error could not be pickled.  This could
cause pool methods to hang.

In 3.x this was fixed by 0aa8af79359d (which also added
an error_callback argument to some methods), but the fix
was not back ported.