* src/vcg.c (complain.h): Include it.

* src/vcg.c (complain.h): Include it.
Unepitaize `return' invocations.
[NDEBUG] (main): Remove.
* src/vcg.h (node_t, edge_t, graph_t): Constify the char * memebers.
* src/files.c (open_files): Initialize graph_obstack.
* src/print_graph.c (print_actions): CPP out useless code.
(print_core): Don't output the last `n' in labels.
Use `quote'.
* src/files.c (output_files): Output the VCG file.
* src/main.c (main): Invoke print_graph ();