This tool is intended to remove diagonal edges from triangulated editable poly.
Optional features are:
- keep edges that have angle between faces more then specified (set 0 if this feature is not needed)
- keep UV border edges (only 1st UV channel used)
- keep non-smoothed edges
Hint: if you're not happy with the result of the script function just execute undo once, you'll get all removed edges back and selected so you can fix selection and remove edges manually.