Delete manuscripts

The parts of this that were our fault were straightforward (adding a new action to a store is nice and straightforward).  There was a weird bug with our experimental version of entypo that I managed to find a fix for.

The only interesting/clever bit here was how I ended up using LESS's pattern-matched mixins to change the background color of "dangerous" buttons.  It might end up being too clever, but I kind of like it.