A bug has been found in the MPI version: when reading the meteo data, only the master was able to pre-read the data but it was never broadcasted... thus forcing all workers to re-read the data themselves. The MPI outputs have also been cleaned up in order to reduce the deluge of messages in a parallel simulation. Whenever possible, only the master prints the messages. Multiple copies have been kept when this would help understand what is going on in a parallel simulation.