Renamed and moved FlexibleTreeView to CollectionViewPage.
Remove redundant boost include.
Removed obsolete extraHeader from CollectionViewPage.
Hide composer column per default and removed obsoleted code from CollectionViewPage.
CollectionViewPage should do all the grunt work. Pass the collection_ptr to its ctor.
Removed a bunch of unneeded code from CollectionViewPage.
Cleaned up CollectionViewPage ctor and removed obsoleted code.
Removed old SuperCollection related methods in TreeModel.
Reload Collection-related models when it changed.
Correct warning message in ColumnView.
Store model pointers in a QPointer for safety.