Bug#675520: mpi4py: New upstream version (1.3)

[Bradley M. Froehle]

Great!  I (force) pushed the change to the branches at
https://github.com/bfroehle/debian-mpi4py

I think I'm still against including the python-mpi binaries, but if we
wanted to use that branch we would also need to write up a quick man page.

-Brad