Add bytearray and add a memoryview test

don't let AttributeError exceptions bubble out of softspace.  fixes fasta.py

virtualenv fixes

implement PyNumber_Divmod to fix datetime.timedelta(0)

Add unichr()

make tester produce useful help messages

Also, try to set the HAVE_NEWBUFFER flag more accurately

Add file.isatty
sys.exit(None) -> exit code 0
non-dict kwargs
hash(function)
CPython's implementation of PyCallIter

add a json test and get it running

Bunch of small missing features, but with these and some small
workarounds inside django, we can run django-admin to the point
that it gives us the help message and then quits.

This is needed for defaultdict

Also make some of the functions work correctly with list subclasses.

We used to just ignore these, but we can call these from
the proxy_to_tp_traverse and proxy_to_tp_clear adapters.

We already did proper index handling in setitem but hadn't ported
it to delitem; now delitem just delegates to setitem.

Also add instance.__contains__