Revision 2415

ChartRendererStyle:
- cache mapping "SeriesKey >> SeriesIndex", new methods getSeriesIndex(.), styleUsesSeriesKeys()
- maintain visibility of lines (default and by series)
- BugFix: apply series properties by seriesKey had used wrong index to access ChartRendererStyle arrays
- LegendLabelGenerator/LegendTooltipGenerator: consider seriesKey
ChartStyleUtil:
- new method applyStyleFromXML(.) apply XML Style to existing ChartStyle object
ChartStyleXMLFactory:
- new renderer style property "linesVisible"