Group xrefs by id rather than name.
Group xrefs by id rather than name.

* Reviewed XRefs are also separated from the rest so we can send them to the UP section

ebi-uniprot/ProtVista,ebi-uniprot/ProtVista,ebi-uniprot/biojs-vis-proteinFeaturesViewer,ebi-uniprot/biojs-vis-proteinFeaturesViewer