Twelve diagrams added

Some TikZ friends wondered, why there was again a pretty long time without updates to the TikZ gallery. Well, my new job as a network engineer at an airline required pretty much time, and my two lovely kids keep me busy too. At evenings, I usually find some time for TeX forums, and for maintaining servers, and for writing another book, which will appear soon. It kept me a bit focused and away from here, just daily reading the community feed. Since it’s nearly finished, I posted twelve diagrams which are from of the upcoming LaTeX cookbook, which contains over a hundred recipes for doing LaTeX things. The examples are without much explanation, which are in the book, to appear soon.