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        /** \brief Create hole by opening a slit at a vertex.

        This function creates a hole by slitting the mesh at a vertex v along a pair of halfedges.

        The function returns the vertex created by this operation.

        The first halfedge h_in is oriented towards the vertex and the second, h_out, away from the 

        vertex. Neither h_in nor h_out may be boundary halfedges for a hole since the result would be

        two holes separated by an edge. That is an abomination we should avoid. In particular because

        it would be invisible. h_in and h_out also should not be each other's opposite edges. That would 

         result in an isolated vertex. */

         VertexID slit_vertex(VertexID v, HalfEdgeID h_in, HalfEdgeID h_out);

        /** \brief Create hole by slitting open the mesh along the path given as argument.

         This function returns the HalfEdgeID of one of the halfedges bounding the created hole.

         The path is specified as a selection set of vertices. If the selected vertices form a closed 

         loop, a piece is cut off from the mesh. Surprising results can occur if the selected vertices

         can be connected by more than one sequence (or a self intersecting sequence) of edges. */

        HalfEdgeID slit_edges(VertexAttributeVector<int>& selection);