Users that have put their terminal node into anonymous state (e.g.
by using the ;anon command) should not have their identity exposed
to non-sysops. This flaw was reported by altere in #synchronet.

I'm not supporting translation of "Anonymous" here. We're not doing
that for anonymously-posted messages either (yet), so I figured that
was okay for now. There is a text.dat string for the word "Anonymous",
it'd be nice if we just reused that, maybe.

I also changed the node.status value magic number (3) to NODE_INUSE
since we're loading nodedefs.js anyway, might as well.

I'm not sure if it matters, but root/api/system.ssjs does not have
this anonymous check either. I'm not sure where that code is used.