python: add bindings for set of unsigned int

Requested by Marek Jankola.

* python/spot/impl.i: Add bindings for std::set<unsigned>.
* tests/python/powerset.py: New file.
* tests/Makefile.am: Add it.
* THANKS: Add Marek.

tests/python/powerset.py

@@ -0,0 +1,31 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2023 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/>.
+
+import spot
+import spot.gen as gen
+from unittest import TestCase
+tc = TestCase()
+
+# Make sure we can iterate on the states of a power_map.
+a = gen.aut_pattern(gen.AUT_CYCLIST_TRACE_NBA, 1)
+p = spot.power_map()
+d = spot.tgba_powerset(a, p)
+tc.assertEqual(p.states_of(0), (0,))
+tc.assertEqual(p.states_of(1), (0,1))
+tc.assertEqual(p.states_of(2), (0,2))