Updating the cookbook

Update 05/26, added an incomplete draft of new chapter, yay😀, there's still a lot of work to do. Update 05/19, found some nasty typos in the old document.  

04/22. For a while I've been wanting to expand the cookbook, with applications. The theory part will always be incomplete [although it really needs chapter(s) on strong correlation, molecular dissociation, and electronic transport], advances happen by the hour in the literature. But computational applications are simply too important. So I hope the cookbook will double in size this year, with the new half devoted to applications. A crazy winter quarter is over!, and spring is slowly warming up, so it's time to add recipes to the notes