···1122* marks some incompatible change
3344+version 1.8.8, October 17, 2017
55+-------------------------------
66+ o fixed installation (Virgile Prevosto, Jacques-Pascal Deplaix)
77+ o safe-string compatible (Jacques-Pascal Deplaix)
48 * fixed method get_edge_layout of class abstract_model of DGraphModel.Make. The
59 bug could have occured when there are several edges between two vertices.
610 o [Traverse/Pack] added Dfs.fold and Dfs.fold_component (tail-recursive)