Merge #2088: Update Zenmap to Python 3 and PyGObject

Note: Ndiff build will be broken until subsequent changes are made.
Deprecation warnings will need to be addressed in future changes.
Closes #2088

zenmap/radialnet/util/drawing.py

@@ -61,7 +61,7 @@
 def cairo_to_gdk_color(color):
     """
     """
-    new_color = range(len(color))
+    new_color = list(range(len(color)))
 
     for i in range(len(color)):
         new_color[i] = int(color[i] * 65535)