o build_options: ifort+mpi_aces optfile (following Constantinos advise):   allow different versions of ifort (8 or 9) and different versions    of mpi (mpich or mpich2) to be used with the same optfile.   requires to load a netcdf module and set MPI_INC_DIR (see comments inside    optfile). Change testing scripts (example_scripts/ACESgrid) accordingly.
o build_options: ifort+mpi_aces optfile (following Constantinos advise):
  allow different versions of ifort (8 or 9) and different versions
   of mpi (mpich or mpich2) to be used with the same optfile.
  requires to load a netcdf module and set MPI_INC_DIR (see comments inside
   optfile). Change testing scripts (example_scripts/ACESgrid) accordingly.

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