viral-ngs: v1.6.1

Updates: make easy-deploy script more generic (less Broad specific) more documentation updates bugfixes to snakemake rules add more forgiveness in pre-Trinity filtration steps (duplicate removal, unpaired read removal) when read counts are below subsampling threshold. In particular, the last set of changes will increase the success rate of de novo assembly when viral genomes are degraded or have small fragment / segment sizes and have adapter read through issues in the second read