Set the model for the data, header/index and level views.

def setModel(self, model, relayout=True):
        """Set the model for the data, header/index and level views."""
        self._model = model
        sel_model = self.dataTable.selectionModel()
        sel_model.currentColumnChanged.connect(
                self._resizeCurrentColumnToContents)

        # Asociate the models (level, vertical index and horizontal header)
        # with its corresponding view.
        self._reset_model(self.table_level, DataFrameLevelModel(model,
                                                                self.palette(),
                                                                self.font()))
        self._reset_model(self.table_header, DataFrameHeaderModel(
                                                            model,
                                                            0,
                                                            self.palette()))
        self._reset_model(self.table_index, DataFrameHeaderModel(
                                                            model,
                                                            1,
                                                            self.palette()))

        # Needs to be called after setting all table models
        if relayout:
            self._update_layout()