Implement fragment deduplication in data writer

The strategy is simple:
 - The data writer function that write data/fragment blocks get
   access to the list files.
 - When writing a fragment, we look for an already written file that has
   a fragment with the same size and checksum.
 - If we find one, we throw away the fragment and reuse the existing one.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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