Use 'from __future__ import absolute_import' to make the right paths be imported

python/openEMS/__init__.py

@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
 #
 # Shortcut openEMS import
+from __future__ import absolute_import
+
 from openEMS.openEMS import openEMS

python/openEMS/nf2ff.py

@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+from __future__ import absolute_import
 
 import os
 import numpy as np

python/openEMS/ports.py

@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+from __future__ import absolute_import
 
 import os
 import numpy as np