A new "Show Cumulative Curve" checkbox on the grid statistics data source adds a cumulative curve on the right axis, in addition to the regular histogram curve. The cumulative curve shares the data source of its non-cumulative counterpart and follows all changes to it. The cumulative sum works with all frequency types and both graph types.
Remove the legacy Grid Statistics dialog (RicGridStatisticsDialog) and its context menu command, which provided the previous cumulative display.
* Add drag'n'drop support for ensemble summary vectors and ensembles into histogram plots
* Make sure histogram plot is shown and all update signals are connected when loading a project.
* Support ensemble parameter drag'n'drop from data sources into histogram plots.
* Show ensemble parameters in data sources tree.
* Add copy/paste of histogram curves
* Re-use all existing parameters in a plot when dragging a new ensemble into it