Merges the following fixes: >4025913Merge pull request #949 from janetournois/BGL-fix_conversion_of_boundary_halfedges-jtournois >9c62628Merge pull request #948 from janetournois/PMP-fix_assertion_isotropic_remeshing-jtournois >f61402dMerge pull request #929 from sloriot/Polyhedron_demo-Isotropic_remeshing_preserve_duplicates See also: * https://github.com/CGAL/cgal/pull/949 * https://github.com/CGAL/cgal/pull/948 * https://github.com/CGAL/cgal/pull/929