
   Use the packet information to limit the entry range of interest in TTreeCache.
   This increases the efficiency of prefetching, avoiding multiple reads of parts
   of files, especially in cases when the packet size is smaller that the cache
   size.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@25965 27541ba8-7e3a-0410-8455-c3a389f83636

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