Fix: Preservation package check fails when multiple copies of an item are already preserved (Issue 108) #109
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When multiple copies of a preserved item exist in a remote storage, hash comparison is performed against just one copy during preservation package check (#102) which could lead to an assumption that the eventual preservation package does not exist and the item is sent for processing rather than been skipped.
This PR creates a list of an item's preserved copies hashes if any exist and the current hash is compared against hashes of all existing preserved copies. The item will be skipped if a match is found. A warning will be logged if multiple preserved copies are found for an item.