[PyQt] minor svgviewer fixes

[Hans-Peter Jansen]

Hi Phil et al,

here are some minor svgviewer fixes:
 * the bubbles animation looks fine (again?!?)
 * highQualityAntialiasingAction handling fixed
 * wheel zooming works now (instead of throwing exceptions)

Could somebody explain, what the background option/action is supposed to do?
To me, it looks like it is trying to fill the backgound with a white rect, 
which is then superseeded by setBackgroundBrush()/SvgView.drawBackground().

Also reimplementing SvgView.drawBackground() with what I consider default 
functionality seems superfluous. 

But anyway, it's en par with the Qt one now.

Pete
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