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Added builtin op implementations for RMA-only ops.  MPI_REPLACE was not defined
in the op_table prior to this commit.  Also includes an alternate
implementation of the linked list test that uses fetch-and-op with these
operations to enable the use of shared locks.

Reviewer: goodell

This test case covers dynamic windows and compare-and-swap.  It differs from
the same example code in the spec; it uses lock/unlock instead of the new MPI-3
synchronization routines.

Reviewer: buntinas