add a relation closure to grab homologues

[nathandunn]

https://monarchinitiative.org/gene/NCBIGene:3973

https://solr.monarchinitiative.org/solr/golr/select?defType=edismax&qt=standard&indent=on&wt=csv&rows=100000&start=0&fl=object,object_label,object_taxon,object_taxon_label,relation,relation_label,evidence,evidence_label,source,is_defined_by,qualifier&facet=true&facet.mincount=1&facet.sort=count&json.nl=arrarr&facet.limit=25&facet.method=enum&csv.encapsulator=&csv.separator=%09&csv.header=true&csv.mv.separator=%7C&fq=subject_closure:%22NCBIGene:3973%22&fq=object_category:%22gene%22&fq=relation_closure:%22RO:HOM0000001%22&facet.field=subject_taxon_closure_label&facet.field=object_taxon_closure_label&q=:

[cmungall]

not totally sure what this ticket is for...

[nathandunn]

@cmungall Its to grab Homologues for a gene. I think its a nice use-case.

[nathandunn]

[nathandunn]

I think this is working adequately