- an include missing on OS X
- change serialization in the general case where hdf5 can be used,
(version of hdf5 high enough) to use only one buffer,
not a buffer per field.
- put back the mpi_param example.
- parameters : clean, add back serialization. Clean whitespace
- serialization : depending on the version of the hdf5 lib,
uses h5 or boost.
- TODO : test it on a machine with new hdf5.
