Demon Trainer (Continued)

Since Blizzard won't let me hook functions to prevent you from accidentally selling grimoires back to the pet trainer, I have added two warnings, one when you first open demon trainer and another if/when you inadvertently sell (at a loss) the book back to the trainer. It won't stop you from losing money, but at least you'll be aware of what happened. YOU MUST CLOSE DEMON TRAINER FRAME before attemtpting to learn any newly purchased grimoire