stats: use %g to print the (generic) acceptance condition

* src/tgbaalgos/stats.cc, src/tgbaalgos/stats.hh: Implement %g.
* src/bin/common_aoutput.cc, src/bin/common_aoutput.hh:
Document it, and also implement %G.
* src/tgbatest/acc2.test: New file.
* src/tgbatest/Makefile.am: Add it.

src/tgbatest/Makefile.am

@@ -62,6 +62,7 @@ taatgba_SOURCES = taatgba.cc
 # because such failures will be easier to diagnose and fix.
 TESTS = \
   acc.test \
+  acc2.test \
   intvcomp.test \
   bitvect.test \
   ltlcross3.test \

src/tgbatest/acc2.test

@@ -0,0 +1,31 @@
+#!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2015 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
+
+../../bin/ltl2tgba -H 'GFa & GFb' > in
+grep 'Acceptance:' in > expected
+../../bin/ltl2tgba -H 'GFa & GFb' --stats='Acceptance: %a %g' > out1
+../../bin/autfilt -H in --stats='Acceptance: %A %G' > out2
+diff out1 expected
+diff out2 expected