Prepare for an infinite canvas mode in the canvas controller.
The methods centerCanvas and isCanvasCentered got replaced by setCanvasMode and canvasMode which are setters/getters for the CanvasMode enum. Possible modes are Centered, AlignLeft, Infinite as of now. Centered and AlignLeft map to the old centered/uncentered behaviour, Infinite is not implemented yet. svn path=/trunk/koffice/; revision=648567
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