Major thanks go to Ernesto Ferro, who has been making many large refactorings in the code to improve maintainability. He also found a nice new example, called Gh0stenstein (see picture below). Paul Haeberli has also triggered several very useful improvements.
Besides refactoring, most changes are minor fixes or improved tests. But there are quite a few of them. There are also 3 new examples, meaning there are now 75 examples in total, which I think is a milestone in itself.