* `commentary` -- a subjective opinion, by Chris Pressey, of the node
* `subtitle` -- expanding on the name of the node
* `acronym-for` -- expanding the name of the node
+* `hidden` -- if true, does not show up in `related()` lists
Each node can have a `domain`, which influences how breadcrumbs are
"Console: Virtual" is an implementation "contained in" the
Corona: Realm of Magic distribution. This is a little weird.
+Make commentary and links into blocks so they can be overridden.
+ if self.data[thing].get('hidden', False):
rel = self.data[thing].get(relationship, None)