Re-enable HDF5 parallel interface. (reverting commit 9c195f33). It works only in a few specific cases (1d topology + cuting direction in the last varying direction)

- set precision kind as a input parameter; fix f2py bug
- update fftw interface (fortran) and diffusion op

fix install process
review tests process
fix (partial) arnoldi stuff which depends on lapack
...

Added missing main source (planner.cpp), added rpath and macro define parsing in setup.py.in, extended swig coverage

Added another missing dependency, fixed fftw optional modules, added fftw quadmaths support with gcc.

Fix du cmake pour la génération de HySoP/hysop/f2hysop.pyf, ajout de FindSWIG.cmake pour corriger le bug de version trouvée.

Modified CMake and setup.py.in to generate only one swig c++ lib and use it for c++ mains and tests.

- fix bug poisson
- comment googletests (temp)
- comment fftw extra libs (fftwq ..., temp)