Merge branch 'master' of ssh://pb:2203/seq_crumbs

somo code errors detected by landskape.io

bugfix: threads not used in calculate_distance_distribution

remove error files from tests

make get_thread function consistent in all returns

remove some stderr prints

bugfix: remove cheking of the user given format files

implemented use_length in filter_duplicates binary

implemeented use_length in filter_duplicates function

update to latest toolz module namespace

fix tests

added oligo file option to filter_by_blast_short

added function to map with tophat

sqlitecache. added dump

__contains__ added to sqlitecache