Issue #22423: Unhandled exception in thread no longer causes unhandled
AttributeError when sys.stderr is None.

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branch : 3.4
Issue #21332: Ensure that ``bufsize=1`` in subprocess.Popen() selects line buffering, rather than block buffering.

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branch : 3.4
Merge heads

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branch : 3.4
Issue #22423: Fixed debugging output of the GROUPREF_EXISTS opcode in the re
module.

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branch : 3.4
Fixed issue #22415 number in Misc/NEWS for changeset e99a1df8db36.

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branch : 3.4
Typo: headeronly -> headersonly

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branch : 3.4