STYLE: more consistent shell style in tutorial run/clean scripts

tutorials/multiphase/interFoam/ras/Allclean

@@ -1,4 +1,5 @@
 #!/bin/sh
+cd ${0%/*} || exit 1    # run from this directory
 
 # Source tutorial clean functions
 . $WM_PROJECT_DIR/bin/tools/CleanFunctions
@@ -6,17 +7,23 @@
 keepCases="damBreak"
 loseCases="damBreakFine"
 
-for case in $keepCases
+for caseName in $keepCases
 do
-    (cd $case && foamCleanTutorials)
+(
+    cd $caseName || exit
 
-    if [ "$case" = "damBreak" ]
+    foamCleanTutorials
+
+    if [ "$caseName" = damBreak ]
     then
-        cp $case/0/alpha1.org $case/0/alpha1
+        cp 0/alpha1.org 0/alpha1
     fi
+)
 done
 
-for case in $loseCases
+for caseName in $loseCases
 do
-    removeCase $case
+    removeCase $caseName
 done
+
+# ----------------------------------------------------------------- end-of-file