Improve query for absence phenotypes

[balhoff]

Currently absence phenotypes are very difficult to navigate in faceted browsing—either they are impossible to find or they can't be queried along with other phenotypes for a structure.

[balhoff]

Need to test adding phenotype_of relations to absence phenotypes—can this interact cleanly with reasoning?

[wdahdul]

Still need this to work for queries to the term 'absent'

[balhoff]

Need to make 'absent' searches automatically perform 'lacks all parts of type' searches.

[hlapp]

Is this needed for the Evolution 2019 workshop? If yes, @balhoff or @wdahdul can either of you add it to the respective project?

[balhoff]

I requested some changes to PATO which will make this more feasible: pato-ontology/pato#243

[balhoff]

The phenotype_of changes appear to be working well. What still remains to be done is to add axioms to the KB that lump "reciprocal" queries together (facilitated by pato-ontology/pato#243 which is now merged).