remove unnecessary code from MPI-3
remove unnecessary code from MPI-3

1) counter_inc was not used anywhere.  delete this function.
2) removed superfluous MPI_Win_fence.
3) removed "#if 0" code that called MPI_Win_fence.

It is much cleaner to use _only_ Lock(_all) and Unlock(_all)
synchronization in PGAS models using MPI-3.  It keeps things simple and
should reduce the chance of programmer errors.

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