The information in this book only applies to the following classes:
	magic user classes which use books.

Each such class should have its own type of spellbooks, and the books
should be semi-randomly generated. These classes with books should start
with one of two (randomly determined) static spellbooks.

Learning versus using:
	ADOM uses a system where casters 'learn' spells from books
		by studying them, and then they don't need the book.
		IIRC, the book eventually disappears after they've
		learned from it often enough.
	Moria-family uses a system where casters learn spells once,
		from books they carry around with them, and they
		keep on needing the book to cast the spell. Books
		don't disappear.

I don't know what model I want to use yet, if not a mix. Maybe different
wizardish classes should go different ways.