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This is preparing to separate out the auxiliary functionality, and perhaps leave space for making more of it in future. The previous name 'edsf' was too vague: the 'e' stood for 'extended', and didn't say anything about _how_ it was extended. It's now called a 'flip dsf', since it tracks whether elements in the same class are flipped relative to each other. More importantly, clients that are going to use the flip tracking must say so when they allocate the dsf. And Keen's need to track the minimal element of an equivalence class is going to become a non-default feature, so there needs to be a new kind of dsf that specially tracks those, and Keen will have to call it. While I'm here, I've renamed the three dsf creation functions so that they start with 'dsf_' like all the rest of the dsf API.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.