* Enable surface reordering support. Automatically update surface in view ordering based on surface collection ordering
* Remove obsolete code
* Enable drag'n'drop support for surfaces within a surface collection. Still missing the collection update part.
* Bring back code lost in prev. commit
* Add code to accept drops in surface collections. Keep view in sync.
* Add command for adding additional surface folders.
* Make sure we use the current surface collection as our parent when importing
* Enable name editing.
Make sure we use the correct surface collection when importing/creating surfaces
* More work on getting surface collections working.
* Clean up naming
* Make sure name for surfaceinviewcollection is read only
* Support drawing surfaces from subcollections, too
* Allow deleting subfolders.
Fix legends in view
* Refactor topmost flag for surface collections.
* Fix reload surface to work in all subfolders, too
Add copy surface skeleton. Actual copy operation is still missing
* Add support for copying surfaces
* Remove possibility to choose I and J slice directions for grid case surfaces.
* Fix warnings.
* Make sure we create the surface folder at the correct level
* More warning fix
* Use XML serialization for copy operation
* Fix missing delete
* Fix typo
* Remove unnecessary method.
