[igraph] Layers for edges in plot

[Przemek Grabowicz]

 Dear Gabor and Tamas,

I am trying to plot my graphs in such a way that they clearly show some 
structural patterns. For this purpose I need to show some kind of edges 
on top of many others, e.g. thick red edges in the foreground and many 
normal gray edges in the background. I'm wondering if there is any way I 
could possibly achieve this under igraph. As far as I can see what 
plot(graph) function does right now is plotting nodes one by one with 
their edges, edges always under nodes, therefore it seems that sorting 
edges wouldn't help. What could I possibly do then?

Best,
Przemek.