This rearranges the priority order of the node-sets of net.

Any node-sets contained in the comma-separated string nodeset_order will become the highest priority, with the nodes earlier in that list being higher priority. The priority of nodes not mentioned in nodeset_order will not be modified.

The purpose of the node-set priority order is just to determine which node-set to use for coloring a node in Netica Application.

Pass NULL for vis; it is only for future expansion.