DunGen & DunMap content update

With the new theme tag system in place for details, I spent a couple hours this morning adding to the details list, so there are more to choose from when a theme or two is selected. I'm also experimenting with doubling up on details. Currently one room in six has a detail, and now one in three with a detail gets a second one. I may have to do some sort of weighting system though, so when I add variations, like more kinds of books or corpses, they don't imbalance the table too much in favor of books or corpses.