[svn-r5243]

Purpose:
    Bug fix
Description:
    Different MPI implementations use different ways to
    pass MPI objects between C and Fortran layers. MPI-2 defines
    a standard set of MPI_*_c2f(f2c) functions for this purpose.
    Unfortunately it is not implemented everywhere and makes
    code non-portable between different parallel platforms.
Solution:
    Always use MPI_*c2f(f2c) functions in our code. Configure
    finds out if those functions are available. If not, then we define
    macros to immulate those functions.
Platforms tested:
    IRIX64-6.5 (modi4) and SP3 (seaborg.nersc.gov). On those platforms
    functions do not exist and we use macros. Bill will test on
    HPUX System V (SDSC machine) to check if this works when functions
    are defined. Preliminary testing showed that it worked.

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