Handle getEvent processing where multiple top-level EventData entries have the same SuperPkgId

[jallentxbiomed]

• Added logic to getBulkEventData and getNextLevelEventDataSuperPkgs that saves a child's ParentSuperPkgId in the nextLevelEventDataSuperPkgs HashMap if multiple parents share it's parentSuperPkgId.

i.e. - Map<Integer, Map<Integer, SuperPackage>> is now Map<Integer, Map<Integer, Pair<SuperPackage, Integer>> where the Pair structure is SuperPackage and associated parentEventDataId

• Updated & optimized comments throughout the bulk processing SND code because it took me awhile to remember what it was doing when going through the code initially.