* src/vcg.c (open_edge, close_edge, open_node, close_node): Change

* src/vcg.c (open_edge, close_edge, open_node, close_node): Change
to output informations in fout (FILE*).
(open_graph, close_graph): Likewise.
(output_graph, output_edge, output_node): Likewise.
* src/vcg.h: Update function prototypes.
* src/print_graph.c (print_graph): Open output graph file.
(print_actions): Adjust.
* src/files.h: Remove extern declaration.
* src/files.c: Remove graph_obstack declaration.
(open_files): Remove graph_obstack initialization.
(output_files): Remove graph_obstack saving.