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I couldn't find any documentation either, and this did not help. But many small, fast-moving projects run by volunteers have no documentation, so it's not that unusual.

Having said that, even though it should be a simple piece of software, I did not find it at all intuitive to use. I had a fair idea what it should do, but had trouble making it do it. For example, everywhere it seemed logical to right-click to get some choices to edit or modify data, right-click did nothing. And it seemed to take a lot of left-clicking to use functions, and often they did not do what I expected.