void vik_aggregate_layer_add_layer ( VikAggregateLayer *val, VikLayer *l );
void vik_aggregate_layer_insert_layer ( VikAggregateLayer *val, VikLayer *l, GtkTreeIter *replace_layer );
void vik_aggregate_layer_move_layer ( VikAggregateLayer *val, GtkTreeIter *child_iter, gboolean up );
void vik_aggregate_layer_add_layer ( VikAggregateLayer *val, VikLayer *l );
void vik_aggregate_layer_insert_layer ( VikAggregateLayer *val, VikLayer *l, GtkTreeIter *replace_layer );
void vik_aggregate_layer_move_layer ( VikAggregateLayer *val, GtkTreeIter *child_iter, gboolean up );