change MPI init to support to MPI_THREAD_MULTIPLE

Source/Common/Include/MPIWrapper.h

@@ -73,7 +73,9 @@ class MPIWrapper
 
             int argc = 0;
             char **argv = NULL;
-            int requiredThreadLevelSupport = MPI_THREAD_SERIALIZED;
+            // TODO the MPI_THREAD_MULTIPLE support is needed by project Multiverso.
+            // please make sure using the MSMPIv7 (or openmpi-1.8) and above.
+            int requiredThreadLevelSupport = MPI_THREAD_MULTIPLE;
             int provided;
             int ret = MPI_Init_thread(&argc, &argv, requiredThreadLevelSupport, &provided);
             if (provided != requiredThreadLevelSupport)