Adjust consensus match frequency based on field sizes #402
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PR #364 accidentally removed the heuristic that issues consensus matches more frequently for bigger fields. This PR recovers that heuristic in the form of match credits: Each field manager is now assigned a credit based on its size. Whenever a new free field arrives at the field manager, it adds its credit to the match manager's counter. When the counter exceeds a threshold, the match manager issues a consensus match.