Add future imports and benchexec header with license
+# BenchExec is a framework for reliable benchmarking.
+# This file is part of BenchExec.
+#
+# Copyright (C) 2007-2015 Dirk Beyer
+# All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# prepare for Python 3
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+# THIS MODULE HAS TO WORK WITH PYTHON 2.7!
+
import warnings
import subprocess
import signal
