4.99.4 (unstable): General: * Update API to use gtkmm-3.0. API: * BasicForm - Added add_to_size_group() and remove_from_size_group() methods and the "populate_popup" signal. * DataEntry - Renamed create_data_entry() to create(). - Removed reset() and renamed exand_in_layout() to can_expand() as in the C API. - Added the "expand-changed" signal. * RtEditor - Added new class.