Bug#728085: Pyfftw does not build

[Ghislain Vaillant]

Quick update on my progress:

- Build does not work for python 3.4, but 3.3 is fine. I have added a
DEBPYTHON3_SUPPORTED=3.3 to d/rule as a temporary fix, whilst the
transition to python 3.4 is complete.

- Pbuilder now successfully runs, but you need python-numpy-dbg and
python3-numpy-dbg to be installed before hand. Seems that pybuild calls
"python setup.py clean" before dependency resolution, which requires
numpy. No idea whether there is a way to call the clean target *AFTER*
dependencies are installed or just overrides the clean target myself.

- I have disabled the documentation build for now. Somehow, dh_sphinxdoc
is not able to find the package.