* Only reload calculation data
* Make sure performance is good when a calculated object is added or changed
- avoid recreation of summary file readers
- delete all nodes in address tree representing calculated curves
- build address nodes for calculated curves
* Make it possible to use designated initializer list
- remove default constructor
- move static member to outer scope
* Add helper function to add field on same row
* Main Window: add three dock widgets for splitting project tree
* Main Window: move scripts to separate tree widget
* Add eclipse result addresses to data source project tree.
* Grid Calculator: drag-and-drop for calculation variables.
* Grid Calculator: rename to 'Grid Property Calculator'.