Fix usage of the versionchanged directive.

Patch by Akira Li.
#21725: Add RFC 6531 (SMTPUTF8) support to smtpd.

Patch by Milan Oberkirch, developed as part of his 2014 GSOC project.

Note that this also fixes a bug in mock_socket ('getpeername' was returning a
simple string instead of the tuple required for IPvX protocols), a bug in
DebugServer with respect to handling binary data (should have been fixed when
decode_data was introduced, but wasn't found until this patch was written),
and a long-standing bug in DebugServer (it was printing an extra blank line at
the end of the displayed message text).
Issue #22178: Fix the date of the Windows epoch (Jan 1, 1601).
Closes #22178: Merge with 3.4
Issue #20746: Fix test_pdb to run in refleak mode (-R).  Patch by Xavier de Gaye.
Issue #20746: Fix test_pdb to run in refleak mode (-R).  Patch by Xavier de Gaye.
Issue #17923: glob() patterns ending with a slash no longer match non-dirs on
AIX.  Based on patch by Delhallt.
Issue #17923: glob() patterns ending with a slash no longer match non-dirs on
AIX.  Based on patch by Delhallt.
Issue #21448: Fixed FeedParser feed() to avoid O(N**2) behavior when parsing long line.
Original patch by Raymond Hettinger.
Issue #21448: Fixed FeedParser feed() to avoid O(N**2) behavior when parsing long line.
Original patch by Raymond Hettinger.
Decreased memory requirements of new tests added in issue21448.
Decreased memory requirements of new tests added in issue21448.
Issue 22184: Early detection and reporting of missing lru_cache parameters
merge
Issue #20729: Restored the use of lazy iterkeys()/itervalues()/iteritems()
in the mailbox module.  This is partial rollback of changeset f340cb045bf9.
Issue #20729: Restored the use of lazy iterkeys()/itervalues()/iteritems()
in the mailbox module.  This is partial rollback of changeset f340cb045bf9.
Issue #21445: Pass exception messages correctly to assertTrue in
the FileCompareTestCase.test_matching test.

Patch by Steven Barker.
Issue #21445: Pass exception messages correctly to assertTrue in
the FileCompareTestCase.test_matching test.

Patch by Steven Barker.
Issue #22193: Added private function _PySys_GetSizeOf() needed to implement
some __sizeof__() methods.
Issue #22193: Added private function _PySys_GetSizeOf() needed to implement
some __sizeof__() methods.