Updated the patches for Python 3.2 - these are now simpler as
they do not support bytearray arguments, as these are no longer
used for filenames (the existing code does not support bytearrays
either).

I've put the docs and tests in one patch, and made separate
patches for the code, one for if the linux-pass-unterminated
patch from issue #8372 is applied, and one for if it isn't.

One point I neglected to comment on before is the ability to
specify an address in the Linux abstract namespace as a
filesystem-encoded string prefixed with a null character.  This
may seem strange, but as well as simplifying the code, it does
support an actual use case, as on Linux systems the abstract
namespace is sometimes used to hold names based on real
filesystem paths such as "\x00/var/run/hald/dbus-XAbemUfDyQ", or
imaginary ones, such as "\x00/com/ubuntu/upstart".  In fact,
running "netstat" on my own system did not reveal any non-textual
abstract names in use (although they are of course allowed).