Changes to handle "dedicated" remote nodes in roughly the same way we
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.
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