the hwdown experiment listing.  Just a simple hack I though.  Ye Gads!
That was painful.  On the plus side, I now know the different between all
those SQL join types :-)

Anyway, added a showlastlog variable in the SHOWNODES function.  Currently,
it only gets set if the pid/eid is emulab-ops/hwdown.  Eventually it could
be a parameter so it could be selected for any experiment.