This is just a fix of several things, that might go wrong.

• The command shg did not work. It is no longer needed, so I didn’t notice. The graphics will redraw at a wait().
• The home directory might have ended at two backslashes. This does not harm in Windows.
• The seed function was not documented correctly. It takes 0<x<=1.
• The cleanup removed all files in the image directory starting with the notebook name. This is not the best solution, especially if the image directory is put to the notebook directory. Now, only images are removed.