Consider replacing some terms with PCO classes

[ramonawalls]

I am working on a new term called taxon, which appears to be the same concept as http://purl.obolibrary.org/obo/GENO_0000113 (taxonomic group) (see PopulationAndCommunityOntology/pco#88). The label could just as well be taxonomic unit. This will be the parent to another new term for operational taxonomic unit (PopulationAndCommunityOntology/pco#9. Because these terms have scope well beyond defining genotypes, I think they belong in PCO, which is more general than GENO.

PCO also has a class for population of organisms (http://purl.obolibrary.org/obo/PCO_0000001), which OBI plans to import to replace their population term (see obi-ontology/obi#632). Eventually this term will move into COB, but I suggest replacing your OBI import with the PCO term, and replacing human population (http://purl.obolibrary.org/obo/GENO_0000111) with http://purl.obolibrary.org/obo/PCO_0000027 (collection of humans).

Strain or breed (http://purl.obolibrary.org/obo/GENO_0000112) also probably belongs in PCO, since it is defined as a collection of organisms.