called with
-outfmt "6 qseqid sseqid pident length qstart qend sstart send evalue bitscore"

evalue set depending on target score (score is used to make it comparable to
condenseq, score is independed on db length, evalue is not)

if score 30 is assumed:
evalue for varlen_200.fas: 0.06018122658133507
evalue for varlen_0.01_200.fas: 0.06200512871146202
