don't prepend rank for mpiexec.hydra calls

bfps/_code.py

@@ -443,7 +443,7 @@ class _code(_base):
         script_file.write('mpiexec.hydra '
             + ' -np {} '.format(nb_mpi_processes)
             + ' -ppn {} '.format(nb_processes_per_node)
-            + ' -ordered-output -prepend-rank '
+            #+ ' -ordered-output -prepend-rank '
             + os.path.join(
                 self.work_dir,
                 command_atoms[0]) +