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Three datatype test levels are defined: basic,min,full(default
full).  The default level can be overwritten in runtime by
setting environment variable MPITEST_DATATYPE_TEST_LEVEL.

An MPI test can also specify different level for each datatype
loop by calling corresponding datatype test initialization function
before that loop, otherwise the default version is used.

    Basic     : MTestInitBasicDatatypes
    Minimum   : MTestInitMinDatatypes
    Full      : MTestInitFullDatatypes
Signed-off-by: Pavan Balaji <balaji@anl.gov>