New function findConnectors(node_id) in overlay.js, to return an array of two arrays, with the IDs of the connectors for which which node_id is presynaptic and the connectors for which node_id is postsynaptic.
New function findConnectors(node_id) in overlay.js,
to return an array of two arrays, with the IDs of
the connectors for which which node_id is presynaptic
and the connectors for which node_id is postsynaptic.

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