[igraph] igraph 0.5 and Graph.Tree()

[Marco]

Hello all igraphers!

I am using an old version of the library on an old Fedora machine.

When I build a tree, using:

g=igraph.Graph.Tree(100,3)

and then write the graph to a file (GML format) the result is a
directed graph: the GML file reads:

Creator "igraph version 0.5 Fri Jun 26 12:31:25 2009"
Version 1
graph
[
  directed 1
....

Which is not obvious, since the Tree() should default to
"type=TREE_UNDIRECTED".

Is that a glitch in the old version I am using, or it's a bug?
And if it is the latter, has it been fixed in more recent versions?
Is there a fix without updating?

I guess I should update, but I don't know if the admin will let me :)

Thanks,

marco

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