[issue16551] Cleanup the pure Python pickle implementation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Patch updated in response to Alexandre's comments. In additional to his suggestions some other minor things simplified. _batch_appends and _batch_setitems now use islice instead range. Some bugs found and new issues created (issue17710, issue17711).

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Added file: http://bugs.python.org/file29797/pickle_cleanup_3.patch

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