Add hint from Tony for dust

dotter

  - ??? Just packaged and is available, will be included in next med-bio metapackage

dust:

  - The only information I found is at biolinux doc site

      http://nebc.nox.ac.uk/bioinformatics/docs/dust.html

    Link to upstream does not work.  Please provide link to the source

  - https://github.com/lh3/mdust

    mdust from DFCI Gene Indices Software Tools (archived for a historical record only)

    ftp://occams.dfci.harvard.edu/pub/bio/tgi/software/seqclean/

estscan2:

  - http://estscan.sourceforge.net/

    latest source from 2006 here: https://sourceforge.net/projects/estscan/files/ESTScan2/2.1/