Convert configuration make_3D flag to boolean variable

src/scripts/model_maker.py

@@ -403,7 +403,7 @@ def load_model(model_file):
                     gconf['vec_sph_x'][si] = float(model['geometry_settings']['x_coords'][si])
                     gconf['vec_sph_y'][si] = float(model['geometry_settings']['y_coords'][si])
                     gconf['vec_sph_z'][si] = float(model['geometry_settings']['z_coords'][si])
-        if (model['system_settings']['make_3D'] != "0" and allow_3d):
+        if (make_3d and allow_3d):
             if (max_rad == 0.0):
                 max_rad = 20.0 * max(sconf['ros'])
             write_obj(sconf, gconf, max_rad)