workaround for [#36443] Vertex to UV index doesn't match with 2.68a

- until the <BMesh>.faces.new(..) is scrambling the vertices order (input -> output), i use the workaround, that build a de-scramble dictionary.
  i still thing it is a bug in blender 2.68.

- got rid of unneeded option 'io_scene_ms3d.set_sence_to_metric', Ms3dSetSceneToMetricOperator, set_sence_to_metric