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Single, double and triple bonds in SketchEl

Bond tools and drawn double and triple bonds on the canvas.

What we checked: Can a user draw and change these bond orders by hand?
Result: Yes, tested by running it: Drew three bond orders; changed an existing single to double. Yes, tested by running it. Drew three bond orders; changed an existing single to double.
Version we tested: 1.62, on macOS 27.0.1 arm64
Manual: sourceforge.net