Regenerate C wrappers with Cython 0.19.1 to support Python 3.3.
<site-packages>/mpi4pyto ease the
support for Cython’s
cimportstatement in code requiring to
access mpi4py internals.
As a side-effect of using Cython 0.19.1, ancient Python 2.3 is no
longer supported. If you really need it, you can install an older
Cython and run
python setup.py build_src --force.