* Deprecate single summary plots and plot collections. Replace functionality using summary multi plots. Clean up some code. Fix crash when trying to normalize an empty curve
* Show summary data vectors in project explorer for both summary cases and ensembles.
* Enable Drag to be able to drag'n'drop data vector into future summary plot
* Make sure tree is refreshed on reload/replace operations
* Provide case id and ensemble id in drag/drop object in addition to address
