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  CLASS: Address     --JD
  PUBLIC METHODS:
    Address()          - Default constructor: sid=0; sector=0 (inline)
   Address(sid,sect) - Constructor (inline)
    operator==()       - Returns non-zero if two Addresses match (inline)
    print()            - Prints contents to supplied FILE *. (inline)
 
  USAGE NOTES:
   This should be treated as a struct with an extra constructor, and
   an eprint() method. The eprint() method is intended for internal
   use only.
  
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  METHOD:  hpACDev::elementAddresses
 
  Returns element addresses (mode sense) information.
 
  ARGS:
 
  struct element_addresses& el  OUT   Struct to hold element addresses info.
 
  RETURNS:
 
  Returns 0 on success, -1 on failure
 
  PRE-CONDS:
 
  --The autochanger was successfully constructed
 
  POST-CONDS:  See return values
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