bin/autfilt.cc: Add '--highlight-languages' option

* bin/autfilt.cc: Add that option.
* tests/core/highlightstate.test: Add test.
* NEWS: Update.

tests/core/highlightstate.test

@@ -0,0 +1,65 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2016 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
+
+autfilt=autfilt
+
+cat >aut.hoa <<'EOF'
+HOA: v1
+States: 4
+properties: implicit-labels trans-labels no-univ-branch deterministic complete
+acc-name: Rabin 2
+Acceptance: 4 (Fin(0)&Inf(1))|(Fin(2)&Inf(3))
+Start: 0
+AP: 2 "p0" "p1"
+--BODY--
+State: 0 {0}
+1
+0
+3
+2
+State: 1 {1}
+1
+0
+3
+2
+State: 2 {0 3}
+1
+0
+3
+2
+State: 3 {1 3}
+1
+0
+3
+2
+--END--
+EOF
+
+cat >expected << 'EOF'
+spot.highlight.states: 0 0 1 0 2 0 3 0
+EOF
+
+$autfilt aut.hoa --highlight-languages -H1.1 | grep -e 'spot.highlight.states'\
+  > res
+
+diff expected res