Fix the Copy method on scales so it returns the right type of scale
Fix the Copy method on scales so it returns the right type of scale

iobeam/plottable,danmane/plottable,palantir/plottable,RobertoMalatesta/plottable,danmane/plottable,onaio/plottable,softwords/plottable,alyssaq/plottable,softwords/plottable,alyssaq/plottable,palantir/plottable,softwords/plottable,iobeam/plottable,NextTuesday/plottable,gdseller/plottable,NextTuesday/plottable,onaio/plottable,NextTuesday/plottable,RobertoMalatesta/plottable,gdseller/plottable,jacqt/plottable,jacqt/plottable,palantir/plottable,gdseller/plottable,alyssaq/plottable,danmane/plottable,iobeam/plottable,jacqt/plottable,RobertoMalatesta/plottable,palantir/plottable,onaio/plottable