[atlas]Probe comparisons

Team, 

The new feature of making probes generally visible is EXCELLENT. It
allows nice comparisons between different probes. For example, I just
compared my Orange DSL probe to a Free probe (both France). The results
are VERY interesting!  (Would be interested to chat with the owner of
this Free probe off line, BTW - can you ping me please?). 

Now of course this leads immediately to a new feature request! :-)  (the
curse of being popular!)

It would be nice to be able to compare a number of probes side by side.
In the simplest case, min/avg/max values (graphs are nice but not
essential). 

Now of course the next feature request :-) that'll come out of this is
to see the full traceroute from each probe, to be able to understand
where the difference in RTT is coming from. 

On the positive side, the beer supply to the developers at the next RIPE
meeting should be plenty! :-) 

Thanks for all your work!
Michael