attr forms closed_or_open curve

Usages:

• Given It forms an open curve

  GEM111 No duplicated points within a polyloop or polyline - v1:18

• Given It forms a closed curve

  GEM111 No duplicated points within a polyloop or polyline - v1:25

• Given It forms a closed curve

  GEM111 No duplicated points within a polyloop or polyline - v1:32