title: igraph other names for edges
body: <p>I have an other question to: <a href="https://stackoverflow.com/questions/39858377/how-can-i-access-the-epath-output-of-get-shortest-paths-to-get-the-edge-names/49192331?noredirect=1#comment85391572_49192331">this topic</a></p>
  
  <p>Is it in igraph possible to give other names for edges ("E1", "E2", "E3") than standart letters like "a","b","c"? And later create the shortest path output with them("E1","E2","E3")</p>
  
  <p>Thank you ;)</p>