Circle (curve) output NURBS option

Слиты Городецкий Никита Сергеевич запросил слияние github/fork/vicdoval/circle_curve_output_nurbs в master

Created by: vicdoval

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  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete (or not required, if user never sees these changes).
  • Ready for merge.