Mario Weilguni <mweilguni@sime.com>	Initial coding
Inge Wallin <inge@lysator.liu.se>	Cleanups, lots of enhancements
Dmitry Suzdalev <dimsuz@gmail.com>      Rewrite to use QGraphicsView
Denis Kuplyakov <dener.kup@gmail.com>   Rewrite to use QML, redesign

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Inge Wallin <inge@lysator.liu.se>       Current maintainer

