Improve ensemble curve colors

* Use unique_ptr
* Improve default assignment of curve appearance
* Improve display of color tags in tree view items
* Select curve or ensemble instead of plot
* Only change curves connected to a Rim-object

* Improve color management for ensemble curves
Use a base color for statistics curves and set realization curves transparent
Make sure new curves are assigned a unique color
Harmonize how dropped addresses are handled

* Update all tags always
The update of tags for a subset of tree nodes is currently broken. Always update all tags.

* Add const

Fwk/AppFwk/cafUserInterface/cafPdmUiTreeViewEditor.cpp

@@ -325,8 +325,7 @@ void PdmUiTreeViewEditor::updateMySubTree( PdmUiItem* uiItem, bool notifyEditors
         }
 
         m_treeViewModel->updateSubTree( itemToUpdate, notifyEditors );
-        QModelIndex itemIndex = m_treeViewModel->findModelIndex( itemToUpdate );
-        updateItemDelegateForSubTree( itemIndex );
+        updateItemDelegateForSubTree();
     }
 }