algo/core/filter: Don't have a hard limit on number of sequences.
Rather we use an uncertainty range (see #3225 for why and how). It is necessary to get the length of the longest transferred sequence as it will be used as a reference to compute the empirical probablity that a k-mer has matched in the longest possible sequence. Therefore we make the assumption that k-mers matched in the longest sequence but we have no way of knowing as we don't keep track of where the k-mers matched. Fixes #3225
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