export tarball. Add check for time in python script. Small change in the
timer in the tests (not that much).

That way no need of using a file to exchange them. Split the mpi job in
two. Change a little bit informations printed in the job.

the changes are the new data layout, the deprecation of the POD cell
adaptors.

Changed tests are:
  - testBlockedAlgorithm,
  - testBlockedAlgorithmDyn,
  - testBlockedMpiAlgorithm,
  - testBlockedChebyshev,
  - testBlockedMpiChebyshev,
  - testBlockedRotation,
  - testBlockedRotationCompare,
  - testBlockedRotationMpi,
  - testBlockedSpeedOperators,
  - testBlockedTaylor,
  - testBlockedTree,
  - testBlockedUniform,
  - testBlockedUniformBench,
  - testBlockedUniformCompare

When using starpu number of threads should be given by env variables (and not command line parameter)