[Bioclusters] Parallel blast

[Wim Glassee]

> Also I don't know *precisely* what the code does.  I only know
> *vaguely* that
> 
> - it can fragment the query sequence and also the database, and
> 
> - it recomputes the final P and E values based on the set of P and E
> values obtained for the query-sequence / database fragments, and
> Paracel is proud on the fact that their final P and E values are
> identical (plus/minus epsilon) to the P and E values that would have
> been obtained by running NCBI Blast on the non-fragmented
> query-sequence and the non-fragmented database.

I'm convinced it should be possible to get the results exactly the same,
although you might have to patch the blast executable a bit.