Fix a bug regarding old unloaded vessels #1278
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−564
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Such vessels can exist, and their parts are not part of a
PileUpso they don't have a tail, which breaks one of our invariants. The fix is to make sure that all parts are put in a singleton byPrepareToReportCollisionsand to collectPileUps for all the vessels inFreeVesselsAndPartsAndCollectPileUps. This simplifies the code somewhat.