* Get rid of "ghost" windows on startup.
Removes hide all docking windows feature for now, to be replaced by a new implementation. Will probably break some tests due to this.
* 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'.