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Replica Manager Prototype, Version 2b.
    
    Does not yet include:
    
    1.  Handling of replication failure or cancel not caused by corrupt file.
    2.  Pool Scrubber emission of CorruptFileMessage.
    3.  Guarantee that p2p from hot pools does not produce a system-sticky copy.
    4.  Added index to t_location_info on ilocation column.