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An extra argument was added to the oputil macros to provide a name,
which can be used to generate union types.  This is needed for
generating types to be included in the RMA packet headers.  The RMA code
is also modified to use this new functionality, replacing the old
hand-coded unions.

Reviewer: goodell@

This version should greatly reduce the chances of a copy-paste error creeping
into the code and should make adding new predefined reduction types easier.

Reviewed by buntinas@.

[svn-r999] checking back in support for MPI_SIGNED_CHAR as it is not the cause of the MPI_Reduce_scatter_user errors in Intel test suite

[svn-r987] backing off changes added for MPI_SIGNED_CHAR in reductions to see if they are the cause of failures in two of the Intel tests