cgal
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Fix tangency of the cut plane with the vertices of the faces
Fix case of non triangular faces having vertices tangent to the clip/refine plane
- clip volume with coplanar faces
TODO:
- [x] clean up and rebase
- [x] add test cases
- [x] add comments in the code
Errors in CGAL-6.2-Ic-48
Successfully tested in CGAL-6.2-Ic-66