[pyxb-users] New Python3 support in git next branch

[Peter B. <bi...@ac...>]

See http://www.pabigot.com/xml/python-23-compatible-source-and-pyxb/ for
the details.  This eliminates the 2to3 script, using a shared source for
all versions of Python.  The python3 branches of the git repository won't
be updated and will eventually be removed.

Any problems you report now are much less likely to be present in the 1.3.0
release.  I have no imminent plans to create that release, though.

Peter