Adding new taxon IDs to taxslim. Adding an ID for every taxon that can be a causative agent in an infectious disease, according to Mondo axiomatizations.

[cmungall]

This includes SARS-CoV-2 (fixing https://github.com/geneontology/noctua-landing-page/issues/30) as well as many other viruses, bacteria, fungi and other organisms of interest to NIH projects

Also adding documentation on normalizing order in subset ID list