Fix memory leak and slowing down when video output is enabled #158
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It seems that when video output is enabled, the old image element does not get removed from the canvas, so they sort of stack.
And while the actual image data is removed each frame, Tk is probably still trying to render all previous frames on top of each other, which is obviously not optimal.
This might fix it. (Edit: Have been running it like that for half an hour and memory consumption hasn't changed at all, so that seems to be an improvement.)