DISCO: create a master relationship table

we need to make a master relationship table that we can use to look up connections between genes in the same and different organisms. this can be used when doing phenosim on the fly, but also can be used for fast lookup from

this should be as broad as possible. for things like orthologs, it should be the union of the ortholog calls found at the MODs, as well as those found at resources like Homologene, Panther, etc. we are looking for breadth with our searches, and multiple ortholog calls will only make the relationship stronger.

i've outlined some of the relationship types.
https://docs.google.com/document/d/1mrCcODiTyDpTDcknkmNK6D0DB8r_iwlFTEbdXQVhBFY/edit