potentialFoam tutorial: updated run and clean scripts

tutorials/basic/potentialFoam/pitzDaily/Allclean

@@ -0,0 +1,11 @@
+#!/bin/sh
+cd ${0%/*} || exit 1    # run from this directory
+
+# Source tutorial clean functions
+. $WM_PROJECT_DIR/bin/tools/CleanFunctions
+
+rm -rf 0 > /dev/null 2>&1
+
+cleanCase
+
+# ----------------------------------------------------------------- end-of-file