ENH: Added removal of postProcessing folder to tutorial clean functions

bin/tools/CleanFunctions

@@ -74,6 +74,7 @@ cleanCase()
     cleanDynamicCode
 
     rm -rf processor* > /dev/null 2>&1
+    rm -rf postProcessing > /dev/null 2>&1
     rm -rf probes* > /dev/null 2>&1
     rm -rf forces* > /dev/null 2>&1
     rm -rf graphs* > /dev/null 2>&1