Well this one does not delete the spells but it allows you to "store" them in the wizards spell book. You can do that by clicking on the spell you want stored, then press and hold the D button and click on the spell again. This should store the spell in the Wizard Spell book. If for instance you want the spells back for enchanting purposes then you can do that as well. (Down side is though that afterwards you have to store the spells you do not use again.)
http://www.tesnexus.com/downloads/file.php?id=20977
It works perfectly for me, so i rather use this one to keep a tidy spell list. Maybe it is useful to you as well.
EDIT: Forgot to mention, the book lies in the Archmages room(Which i think is not the right place.) so if you want it right away then open the console and type...