chart modules | data points -> added the possibility to add additionally datapoint arrays besides simple data arrays to the charts. The current advantage of using data point arrays is that you can define actionhandlers for each data point which will be executed when clicking on a data point in the chart (currently supported by module_jqplot only)

changes for jqplot charts: - BUG: chart will now be displayed even it contains no data
NEW: width of bar charts is now larger