Commits on Aug 19, 2022

1. Eliminating ncbitaxon:root and instead bridging to true organism subc… …

   …lasses
   
   **please read closely and read the related issue before commenting**
   
   This PR removed the statement that COB:organism = NCBITaxon:root
   
   Rationale: root includes non-organisms such as samples
   
   See obophenotype/ncbitaxon#10
   
   This PR replaces that link with two subClassOf axioms
   
    * COB:organism
       * NCBITaxon:Viruses
       * NCBITaxon:cellular organisms
   
   Note that if this were merged, then the union of NCBITaxon and COB would have a lattice at the top. However, it would be trivial to add NCBITaxon:1 to an anti-slim and filter it out, resulting in a tree with COB:organism as the single MRCA of all organism classes
   
   Merging this PR has some advantages such as obviating the need to rename NCBITaxon:1, since we instead simply inject our own true parent. It leaves the structure of labeling of NCBITaxon intact
   
   **Important** please refrain from discussing the definition of organism here, specifically whether it includes viruses. For COB purposes, this is a closed issue. See: #6

   

   cmungall authored Aug 19, 2022
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