Adds two new methods to the DeeModel interface: insert_row_sorted() and find_row_sorted(). Adding varargs convenience functions as well. There are linear default impls covering all our classes in DeeSerializableModel. We have optimized tree-based algorithms implemented for DeeSequenceModel and DeeFilterModel.
The Python support is currently broken on some bug in pygobject. I believed that my pygobject patches on https://bugzilla.gnome.org/show_bug.cgi?id=667244 would fix this, but testing unfortunately confirms that it doesn't.... Fixes: https://bugs.launchpad.net/bugs/913128. Appoved by Michal Hruby.