ENH: use openmpi-1.5.1 for testing

etc/settings.csh

@@ -236,7 +236,8 @@ unsetenv MPI_ARCH_PATH MPI_HOME
 
 switch ("$WM_MPLIB")
 case OPENMPI:
-    set mpi_version=openmpi-1.4.1
+    #set mpi_version=openmpi-1.4.1
+    set mpi_version=openmpi-1.5.1
     setenv MPI_ARCH_PATH $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$mpi_version
 
     # Tell OpenMPI where to find its install directory

etc/settings.sh

@@ -260,7 +260,7 @@ unset MPI_ARCH_PATH MPI_HOME
 case "$WM_MPLIB" in
 OPENMPI)
     #mpi_version=openmpi-1.4.1
-    mpi_version=openmpi-1.5
+    mpi_version=openmpi-1.5.1
     export MPI_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$mpi_version
 
     # Tell OpenMPI where to find its install directory