Fix ie10 graph size

Graphs were being displayed too small in IE10. I've activated the scatterplot scaling workaround for all graphs.

This activated scaling of graphs in IE9, which was explicitly disabled before. This in turn unearthed that all overlays are displayed in the wrong placed when scaling in active in IE9. The bug is currently visible in production on the content explorer, as this is resizing already. I've fixed the SVG scale factor calculation, which fixes overlay placement.