MPE_Finish_log() & MPE_Init_log() are NOT needed when liblmpe.a is linked
because MPI_Finalize() would have called MPE_Finish_log() already.
liblmpe.a will be included in the final executable if it is linked with
either "mpicc -mpe=mpilog" or "mpecc -mpilog"
This routine outputs the logfile in CLOG2 format, i.e.
a collective call over MPI_COMM_WORLD.
This function is threadsafe, but
MPE_Finish_log() is expected to be called only on the main thread
which initializes MPE logging through MPE_Init_log().