Implement token-flow graph pruning #55
Description
Right now token-flow returns a graph with edges corresponding to each match of each of alias of an entity. For the matches with the same span, we really only want to look at the highest scoring. This change should probably be made in token-flow.
To see an example of an unpruned graph, uncomment the line in targets.ts that produces the following output:
============ Hypothetical target 466:1:\d+ ==============
============ Hypothetical target 2122166:1:\d+ ==============
============ Hypothetical target 2122166:1:\d+ ==============
============ Hypothetical target 466:1:\d+ ==============
============ Hypothetical target 777:1:\d+ ==============
============ Hypothetical target 466:1:\d+ ==============
============ Hypothetical target 466:1:\d+ ==============
============ Hypothetical target 466:\d+:\d+ ==============
============ Hypothetical target 2122166:\d+:\d+ ==============
============ Hypothetical target 2122166:\d+:\d+ ==============
============ Hypothetical target 466:\d+:\d+ ==============