[issue15642] Integrate pickle protocol version 4 GSoC work by Stefan Mihaila

[Alexandre Vassalotti]

Changes by Alexandre Vassalotti <alexandre at peadrop.com>:


Added file: http://bugs.python.org/file26795/pickle4.diff

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15642>
_______________________________________