Close #18690: register memoryview with Sequence ABC
Try to fix issue #19134 again
Tweak skipIf message
Merge 3.3
Close #17839: support bytes-like objects in base64 module

This mostly affected the encodebytes and decodebytes function
(which are used by base64_codec)

Also added a test to ensure all bytes-bytes codecs can handle
memoryview input and tests for handling of multidimensional
and non-bytes format input in the modern base64 API.
Drop buildbottouch again; the master is using "make touch" now.
Use cached builtins.
Issue #19132: Add versionchanged tags.
Issue #19147: Fix docstring for fcntl.flock to refer to correct man section.
Issue #19147: merge from 3.3
Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.
Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.
Issue #19014: memoryview.cast() is now allowed on zero-length views.
Issue #19014: memoryview.cast() is now allowed on zero-length views.
[issue19951] Fix docstring and use of _get_suppported_file_loaders() to reflect 2-tuples.
[issue19151] Fix docstring and use of _get_suppported_file_loaders() to reflect 2-tuples.
[issue19152] Add ExtensionFileLoader.get_filename().
[issue19152] Add ExtensionFileLoader.get_filename().
[issue19151] Fix issue number in Misc/NEWS entry.
Remove builtin "caching" in pprint