print duplicate vertex tag


git-svn-id: https://geuz.org/svn/gmsh/trunk@17983 59c8cabf-10d6-4a28-b43f-3936b85956c4
support single-line Dimension field (used by CGAL ?)


git-svn-id: https://geuz.org/svn/gmsh/trunk@17984 59c8cabf-10d6-4a28-b43f-3936b85956c4