Hole Filling

[6ther]

Using hole filling in Python，like this:

`
mesh1 = Polyhedron_3('../../data/swept_mesh1.off')

half_edges = mesh1.halfedges()

for half_edge in half_edges:

path_facets = Polyhedron_3_Facet_iterator()

path_vertices = Polyhedron_3_Vertex_iterator()

triangulate_refine_and_fair_hole(mesh1, half_edge, path_facets, path_vertices)

`

but throw the wrong arguments exception，like this:

i don't know which arguments are wrong.