genaut: minor fixes and add test case

* bin/genaut.cc: Use RANGE instead of N, and document it.
Output the FORMAT documentation, and fix handling of %F and %L.
* tests/core/genaut.test: New file.
* tests/Makefile.am: Add it.

tests/Makefile.am

@@ -151,6 +151,7 @@ TESTS_tl = \
   core/length.test \
   core/equals.test \
   core/tostring.test \
+  core/genaut.test \
   core/genltl.test \
   core/lunabbrev.test \
   core/tunabbrev.test \

tests/core/genaut.test

@@ -0,0 +1,38 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2017 Laboratoire de Recherche et Développement
+# de l'Epita (LRDE).
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot 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 3 of the License, or
+# (at your option) any later version.
+#
+# Spot 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, see <http://www.gnu.org/licenses/>.
+
+. ./defs
+set -e
+
+# Make sure the name of each pattern is correctly output by %F.
+opts=`genaut --help | sed -n '/=RANGE/{
+s/^ *//
+s/[=[].*/=1/p
+}'`
+res=`genaut $opts --stats="--%F=%L"`
+test "$opts" = "$res"
+
+genaut --ks-cobuchi=..3 --stats=%s,%e,%t,%c,%g >out
+cat >expected <<EOF
+3,7,16,1,Fin(0)
+5,14,32,1,Fin(0)
+7,20,48,1,Fin(0)
+EOF
+diff out expected