* NEWS: The -g and --graph options now output graphs in Graphviz

DOT format, not VCG format.
* doc/bison.1: Likewise.
* doc/bison.texinfo (Understanding, Bison Options): Likewise.
* TODO: Remove Graphviz entry.
* src/Makefile.am (bison_SOURCES): Add graphviz.c and graphviz.h;
remove vcg.c, vcg.h, vcg_defaults.h.
* src/vcg.c, src/vcg.h, src/vcg_defaults.h: Remove.
* src/graphviz.c, src/graphviz.h: New files.
* src/files.c (compute_output_file_names): Output .dot, not .vcg.
* src/files.h: Make comment more generic.
* src/main.c (main): Likewise.
* src/print_graph.h: Likewise.
* src/getargs.c (usage): Make usage description more generic.
* src/print_graph.c: Include graphviz.h rather than vcg.h.
(static_graph, fgraph): Remove.  All uses changed to pass
arguments instead of sharing a static var.
(print_core, print_actions, print_state, print_graph):
Output graphviz format rather than VCG format.
* tests/.cvsignore: Remove *.vcg; add *.dot.
* tests/output.at: Expect *.dot files, not *.vcg files.

tests/.cvsignore

@@ -1,4 +1,5 @@
-*.output *.vcg
+*.dot
+*.output
 atconfig
 atlocal
 autom4te.cache

tests/output.at

@@ -1,5 +1,5 @@
 # Checking the output filenames.                    -*- Autotest -*-
-# Copyright (C) 2000, 2001, 2002, 2005 Free Software Foundation, Inc.
+# Copyright (C) 2000, 2001, 2002, 2005, 2006 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -53,7 +53,7 @@ AT_CHECK_OUTPUT([foo.y], [], [-dv -y],
 AT_CHECK_OUTPUT([foo.y], [], [-dv -b bar],
 		[bar.output bar.tab.c bar.tab.h])
 AT_CHECK_OUTPUT([foo.y], [], [-dv -g -o foo.c],
-		[foo.c foo.h foo.output foo.vcg])
+		[foo.c foo.dot foo.h foo.output])
 
 
 AT_CHECK_OUTPUT([foo.y], [%defines %verbose],      [],