foamSequenceVTKFiles, mpirunDebug: Correct call to "usage"

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1946

bin/foamSequenceVTKFiles

@@ -72,7 +72,7 @@ do
       shift 2
       ;;
    -h | -help)
-      printUsage
+      usage
       ;;
    -o | -out)
       [ "$#" -ge 2 ] || usage "'$1' option requires an argument"

bin/mpirunDebug

@@ -250,7 +250,7 @@ MPICH)
 *)
     echo
     echo "Unsupported WM_MPLIB setting : $WM_MPLIB"
-    printUsage
+    usage
     exit 1
 esac