Patch by Arfrever Frehtes Taifersar Arahesis.

#11910: change import_fresh_module to return None when one of the "fresh" modules can not be imported.

#12017: Fix segfault in json.loads() while decoding highly-nested objects using the C accelerations.

Also, reduce code duplication in LargeMmapTests.

Original patch by Steffen Daode Nurpmeso.

Fix for issue 10684: Folders get deleted when trying to change case with shutil.move (case insensitive file systems only)

Patch by Bryce Verdier.

mmap bug with sparse files. Patch written by Steffen Daode Nurpmeso.

check of the object type doesn't read the __class__ attribute anymore.  Fix a
crash if a class override its __class__ attribute (e.g. a proxy of the str
type).

Patch by Lars Michelsen.

constants to be used for STARTUPINFO were exposed due to the change.