Use Gnulib's version-etc-fsf' for --version' and `--help' output.

* m4/gnulib-cache.m4: Add `version-etc-fsf'.  Switch to LGPLv3+.

* GUILE-VERSION (PACKAGE): Change to "GNU Guile".

* Makefile.am (distdir): New variable.

* libguile/script.c (scm_shell_usage): Improve formatting.  Use
  `emit_bug_reporting_address ()'.
  (scm_compile_shell_switches): Use `version_etc ()'.

lib/version-etc-fsf.c

@@ -0,0 +1,30 @@
+/* Variable with FSF copyright information, for version-etc.
+   Copyright (C) 1999-2006 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Jim Meyering. */
+
+#include <config.h>
+
+/* Specification.  */
+#include "version-etc.h"
+
+/* Default copyright goes to the FSF. */
+
+const char version_etc_copyright[] =
+  /* Do *not* mark this string for translation.  %s is a copyright
+     symbol suitable for this locale, and %d is the copyright
+     year.  */
+  "Copyright %s %d Free Software Foundation, Inc.";