review disease / anatomy edges from hetionet

[cbizon]

I was doing some robokop work and ran across a bunch of strange looking disease/anatomy edges, like ulcerative colitis related to sacro-ilaic joint. (see examples in these slides:
https://docs.google.com/presentation/d/1nbeMMq5xij88lQq9_wGSTuBC7RhnAaDl3pwTwTnsZpY/edit#slide=id.p)

Please review what the ultimate source of these is and whether on the whole they are any good, then potentially remove them from the hetionet ingest.