For some reasons, I needed to release a new version of my group
cohomology spkg. Namely, the web repository of cohomology rings had to
change its location due to hardware problems.

Moreover, since Cython is now using Python's infamous name mangling,
I had to change some attribute names. Try

    sage: cython("""
    ....: class Foo:
    ....:     def __init__(self):
    ....:         self.__cache = "hi"
    ....: """)
    sage: F = Foo()
    sage: F.__cache
    ...
    sage: F._Foo__cache
    ...

in sage-5.0 and in sage-5.2.rc0 and then you'll know what I mean.

The new package also solves some pickling problems related with Gap.

Hence: It is mainly a bug fix release. But of course the new package
version needs being reviewed. So, if you have access to different
computers (big and little endian, 32 and 64 bit) and know some algebra,
then I'd appreciate if you could review trac ticket #13295!

Best regards,
Simon