implement variants of the hashes

FUZZY_FLAG_ELIMSEQ: The comparison operation runs eliminate_sequence
    before actually comparing two hashes on both of them. This step can
    be moved to hash generation time using this flag. Suggested by Niels
    Thykier.
FUZZY_FLAG_NOTRUNC: The second part of the hash is truncated to
    SPAMSUM_LENGTH/2 by default. When comparing two hashes with
    different blocksize this can result in a larger edit distance and
    therefore false negatives.

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