transferring items from https://github.com/sourmash-bio/sourmash/issues/3504, as well as others - TODO: * investigate and summarize missing tax records; * investigate and summarize missing genomes - ref https://github.com/sourmash-bio/sourmash/issues/3599 as well as list in #3504; * provide access to full rez databases? https://github.com/sourmash-bio/sourmash/issues/3614 * provide k=21/k=31 for smaller genomes, e.g. fungi? https://github.com/sourmash-bio/sourmash/issues/3649