TUT: add parallel version for various squareBend cases

- adjust commented-out evaluation to avoid warnings.

  With code like this
  ```
  #if 0
  nxin    #eval{ round($nxin / 5) };
  #endif
  ```

  The handling of the "#if 0 / #endif" clause uses the plain ISstream
  parser to tokenize. This means that the "round(" is parsed as a word
  with a mismatched closing ')', whereas the "#eval" parser will slurp
  everything in until the closing brace and send it off as a string
  to the expression parser.

etc/templates/axisymmetricJet/Allclean

@@ -1,8 +1,10 @@
 #!/bin/sh
-cd "${0%/*}" || exit                            # Run from this directory
-. $WM_PROJECT_DIR/bin/tools/CleanFunctions      # Tutorial clean functions
+cd "${0%/*}" || exit                                # Run from this directory
+. ${WM_PROJECT_DIR:?}/bin/tools/CleanFunctions      # Tutorial clean functions
+#------------------------------------------------------------------------------
 
 cleanCase
-rm constant/polyMesh/boundary
+
+rm -f constant/polyMesh/boundary
 
 #------------------------------------------------------------------------------

etc/templates/axisymmetricJet/Allrun

@@ -1,6 +1,7 @@
 #!/bin/sh
-cd "${0%/*}" || exit                            # Run from this directory
-. $WM_PROJECT_DIR/bin/tools/RunFunctions        # Tutorial run functions
+cd "${0%/*}" || exit                                # Run from this directory
+. ${WM_PROJECT_DIR:?}/bin/tools/RunFunctions        # Tutorial run functions
+#------------------------------------------------------------------------------
 
 runApplication blockMesh
 runApplication extrudeMesh