Fixed zoom in schematic

...when I modified the yodalee code to fix the antialiasing stuff I actually borked the zoom function, sorry. I did specify a wrong default value for an optional argument to `ViewPainter::init()`; I have now moved the unused arguments to the end, so there is no need to specify a value for them anymore.
yes, most important is that the fixed scale parameters should have been `0.0, 1.0` and not `1.0, 1.0` as I wrote when fixing #79. Now I have modified the order, so that there is no need to specify these two scale parameters, they are simply left out and will take the default value, as it was before. I was unsure whether `DrawInAntiAliasing` should have a default value or not, probably that is not really needed but I left the default anyway.