Tests do not start

[jubianchi]

When the plugin can't find the atoum binary, the user has no clue on what's happening. The plugin panel seems ok, saying it's "Starting":

I think we should push a message in the event log or somewhere else... I don't know if it's hard to do or not ;)

[agallou]

we could start by adding something like this :

[jubianchi]

perfect!