handle local nodes -- to assign_wrapper and ptopgen, they're pretty
much the same.  If the "dedicated_widearea" node_type_attribute is
set for nodes of class pcRemote, we treat remote nodes like locals.
I stuck with using a node_type_attribute for this, but it makes fast
queries ugly.  I believe node_type_attributes are better than adding
yet another bit to the node_types table, but others may feel
differently.