Add support for an Autotest test suite for Bison.

* m4/m4.m4, m4/atconfig.m4: New files.
* m4/Makefile.am (EXTRA_DIST): Adjust.
* tests/suite.m4, tests/Makefile.am, tests/atgeneral.m4: New
files.
* src/getargs.c: Display a more standard --version message.
* src/reader.c (reader): Formatting changes.
No longer depend upon VERSION_STRING.
* configure.in: No longer use `dnl'.
Set up the test suite and the new directory `tests/.
(VERSION_STRING): Remove.

tests/atconfig.in

@@ -0,0 +1,82 @@
+# @configure_input@					-*- shell-script -*-
+# Configurable variable values for building test suites.
+# Copyright (C) 2000 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
+# the Free Software Foundation; either version 2, 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+# This script is part of Autotest.  Unlimited permission to copy,
+# distribute and modify the testing scripts that are the output of
+# that Autotest script is given.  You need not follow the terms of the
+# GNU General Public License when using or distributing such scripts,
+# even though portions of the text of Autotest appear in them.  The
+# GNU General Public License (GPL) does govern all other use of the
+# material that constitutes the Autotest.
+#
+# Certain portions of the Autotest source text are designed to be
+# copied (in certain cases, depending on the input) into the output of
+# Autotest.  We call these the "data" portions.  The rest of the
+# Autotest source text consists of comments plus executable code that
+# decides which of the data portions to output in any given case.  We
+# call these comments and executable code the "non-data" portions.
+# Autotest never copies any of the non-data portions into its output.
+#
+# This special exception to the GPL applies to versions of Autotest
+# released by the Free Software Foundation.  When you make and
+# distribute a modified version of Autotest, you may extend this
+# special exception to the GPL to apply to your modified version as
+# well, *unless* your modified version has the potential to copy into
+# its output some of the text that was the non-data portion of the
+# version that you started with.  (In other words, unless your change
+# moves or copies text from the non-data portions to the data
+# portions.)  If your modification has such potential, you must delete
+# any notice of this special exception to the GPL from your modified
+# version.
+
+# Snippet (1
+# This debugging script has been automatically generated from `make check'.
+# Call it with `--help' to get a quick usage summary.
+
+at_package=@PACKAGE@
+at_version=@VERSION@
+# Snippet )1
+# Snippet (2
+at_n=@ECHO_N@
+at_c='@ECHO_C@'
+test -f atlocal && . ./atlocal
+
+# LC_MESSAGES is always shadowed by LC_ALL.  Here are the only cases:
+# - GNU:       LANGUAGE -> LC_ALL -> LC_MESSAGES -> LANG
+# - POSIX:     LC_ALL -> LC_MESSAGES -> LANG
+# - XPG4:      LC_ALL -> LANG
+# - SysV/XPG2: LANG
+export LANGUAGE; LANGUAGE=C
+export LANG; LANG=C
+export LC_ALL; LC_ALL=C
+
+srcdir=@srcdir@
+top_srcdir=@top_srcdir@
+# Use absolute file notations, as the test might change directories.
+at_srcdir=`cd @srcdir@ && pwd`
+at_top_srcdir=`cd @top_srcdir@ && pwd`
+if test -n "@AT_TESTPATH@"; then
+  export PATH; PATH=`pwd`:`cd @AT_TESTPATH@ && pwd`:$PATH
+else
+  export PATH; PATH=`pwd`:$PATH
+fi
+
+# We need GNU m4.
+M4=@M4@
+# Snippet )2