Creation of wireless/wired links #97

Hi,

I have build a test showing that checks the creation of links when wired and wireless links are mixed. In this test, the topology has only two nodes: src and tgt.

• The first test creates a wireless link by moving tgt into the communication range of src. Then a wired link is explicitly created between the nodes. Then tgt is moved away from src, out of the communication range.
• The second test creates links in the reverse order.

After each creation of a link I get the number of links using Topology.getLinks().
In the first case the sequence is : 1 2 2
In the second case the sequence is : 1 1 1
What is the expected behavior ?