Add mpi tests for compilation.

    Mpi tests compilation: ok.
    Mpi tests execution: nok.

          Start 42: t-mpi-parallelApply
    42/45 Test #42: t-mpi-parallelApply ..............***Exception: Other  0.04 sec
          Start 43: t-mpi-wrapper
    43/45 Test #43: t-mpi-wrapper ....................***Exception: Numerical  0.02 sec
          Start 44: t-mpi-multipleRoles
    44/45 Test #44: t-mpi-multipleRoles ..............***Exception: Other  0.04 sec
          Start 45: t-mpi-distrib-exp
    45/45 Test #45: t-mpi-distrib-exp ................***Exception: Other  0.03 sec

    The following tests FAILED:
    	42 - t-mpi-parallelApply (OTHER_FAULT)
    	43 - t-mpi-wrapper (NUMERICAL)
    	44 - t-mpi-multipleRoles (OTHER_FAULT)
    	45 - t-mpi-distrib-exp (OTHER_FAULT)

    Plus, t-mpi-eval and t-mpi-multistart never end.