Unlink whatever relation is currently linked on the inside with the specified index number. If the relation is not linked to this port on the inside, do nothing. If a link is removed, then any links at higher index numbers will have their index numbers decremented by one. If there is a container, notify it by calling connectionsChanged(). This method is write-synchronized on the workspace and increments its version number.
@param index The index number of the link to remove.
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