file_transformation: 
  - prefixed chromosomes and scaffolds with "vigra.VC1973A.gnm6."

changes: 
  - 2018-02-27 added "vigra.VC1973A.gnm6." to vigra.VC1973A.gnm6.3nL8.genome_main.fna.gz
  - 2018-03-02 added MANIFEST files
  - 2021-09-14 Folded vigra.VC1973A.gnm6.3nL8.genome_main.fna to line length 100 and added GenBank accessions to deflines. Re-indexed.
  - 2021-09-16 Added file vigra.VC1973A.gnm6.3nL8.scaff_name_hash.tsv; gives GenBank IDs and original sequencing-group IDs
  - 2022-11-07 SC Updated README with citation in more standard form.