ENH: handle partially attached master/slave faces (issue #608)

- addresses problems if faces are already partly attached
  (eg, on a single vertex or along an edge).

tutorials/mesh/stitchMesh/simple-cube1/Allclean

@@ -0,0 +1,8 @@
+#!/bin/sh
+cd ${0%/*} || exit 1                        # Run from this directory
+. $WM_PROJECT_DIR/bin/tools/CleanFunctions  # Tutorial clean functions
+
+cleanCase0
+rmdir constant 2> /dev/null
+
+# -----------------------------------------------------------------------------