#5 fix and extend graph_path

open
nobody
None
5
2006-05-02
2006-05-02
Anonymous
No

graph_path current contains duplicates representing
alternate paths; this isn't particularly useful without
attaching the nodes in the path.

One way is to add the path as a denormalised string;
another way is to use graph_path2term

This will be revisited when we extend graph_path to
allow for different inferences, such as pure is_a
paths, or mixed is_a/part_of paths.

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