Remove unfunctional generic parameter of AdaptiveCell
Add owner filed in AdaptiveCellEdge and purge private constructor QuadrangleAdaptiveCell(AdaptiveCellEdge[]), instead add edges setter

  - modify QuadrangleAdaptiveCellFactory.produce() accordingly
Add AdaptiveCellEdge.findOneBisectionObstructor()
Add findOneFissionObstructor in AdaptiveCell QuadrangleAdaptiveCell
Make AdaptiveUtils with recursivelyFission() and fission()