STYLE: adjust tutorial Allclean scripts (issue #310)

- A few without a 'cd' at the start.
  Several remove files that are already covered by the cleanCase function.

tutorials/preProcessing/createZeroDirectory/motorBike/Allclean

@@ -1,13 +1,15 @@
 #!/bin/sh
+cd ${0%/*} || exit 1    # Run from this directory
 
 # Source tutorial clean functions
 . $WM_PROJECT_DIR/bin/tools/CleanFunctions
 
-# remove surface and features
-\rm -f constant/triSurface/motorBike.obj.gz > /dev/null 2>&1
-\rm -rf constant/extendedFeatureEdgeMesh > /dev/null 2>&1
-\rm -f constant/triSurface/motorBike.eMesh > /dev/null 2>&1
-
-rm -rf 0 > /dev/null 2>&1
-
 cleanCase
+rm -rf 0
+
+# Remove surface and features
+\rm -f constant/triSurface/motorBike.obj.gz > /dev/null 2>&1
+\rm -f constant/triSurface/motorBike.eMesh  > /dev/null 2>&1
+\rm -rf constant/extendedFeatureEdgeMesh    > /dev/null 2>&1
+
+#------------------------------------------------------------------------------

tutorials/preProcessing/createZeroDirectory/motorBike/Allrun

@@ -22,4 +22,4 @@ runParallel $(getApplication)
 runApplication reconstructParMesh -constant
 runApplication reconstructPar -latestTime
 
-# ----------------------------------------------------------------- end-of-file
+# -----------------------------------------------------------------------------