Rework the previous hack stuff for virtual (multiplex nodes). Now its
a new hack for remote nodes! All remote node solving is done in the new wanassign script. That script deals with both phys (ron) and virtual (vrons), as well as fixed nodes of either type. The solution is returned to assign_wrapper, which still does the tunnel stuff. At some point it would be nice to get general purpose virtual nodes (multiplex) working on either local or remote nodes, but thats a ways off cause it means too many changes in assign_wrapper, which really needs a total rewrite.
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