tutorials: Consistency of All* scripts

Various minor changes to tutorial scripts. In particular, ensuring that
they all change to the containing directory so that batches of tutorials
can be run easily from the root of the installation.

tutorials/Allclean

@@ -1,6 +1,9 @@
 #!/bin/sh
 cd ${0%/*} || exit 1    # Run from this directory
 
+# Source tutorial clean functions
+. $WM_PROJECT_DIR/bin/tools/CleanFunctions
+
 dir=${PWD##*/}
 
 echo "--------"