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  CLASS: FileSetList     --AP (modified to use RWGSlist by JKH)
  PUBLIC METHODS:
   FileSetList(size) - Constructor (defaults to room for ten)
    error()            - returns the error state of the list (inline)
    clear()            - shrinks the list and deallocates the list (inline)
   append(ext)       - appends an entry to the list
   at(i)             - accesses the ith entry in the list
   remove(n)         - removes the nth entry in the list
    getCount()         - returns the number of entries in the list (inline)
 
  USAGE NOTES:
   fsdSeqExtents is for internal use only.
  
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