Using Qwt Plots: more functionality in the app

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Added some more functionality. Now we can see the source and the prediction graph on left side. On right I'm showing the filtered results. The algorithm is still a bit whacked up, but the UI does look good.

The additions were: Stylesheets for styling the groupbox and the graphs - canvas and curves. I also used QPens to make the curves look better. Also added a checkbox for providing anti-aliasing. It doesn't look that good on current graph but if there's a simpler graph then that may benefit from anti-aliasing.

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