fix codegree call in CMap3Builder::sew_volumes
fix codegree call in CMap3Builder::sew_volumes

etienneschmitt/CGoGN_2,david-cazier/CGoGN_2,cgogn/CGoGN_2,untereiner/CGoGN_2,david-cazier/CGoGN_2,untereiner/CGoGN_2,cgogn/CGoGN_2