Added pre-processing stage to preclude from consideration:
1. All files with unique size.
2. Of files with the same size and inode number, ditch all but
the last.
3. Of files with same size and different inodes, compare first
128 kb, if not different there do md5sum on both.
4. Only if the hashes are the same write output records for both.
Moved version to 1.0.3.
Changed duplicates.1 to suit new processing method.