Changed CPTXYPlotSpace to allow the plot space to scale programmatically even when user interaction is disabled. Fixed issue 308.
Changed CPTXYPlotSpace to allow the plot space to scale programmatically even when user interaction is disabled. Fixed issue 308.

aufflick/core-plot,aufflick/core-plot,aufflick/core-plot,aufflick/core-plot,aufflick/core-plot