Create distinct activity instances per gene product -> gene product pair

[dustine32]

An MF should be a distinct instance if it has a different molecular target (for SIGNOR this is interactor B). We should capture the target with has input: (interactor A) <-enabled by-(MF)-has input->(interactor B). So in most cases this means that each line of the SIGNOR file will give a distinct instance of an MF.

[dustine32]

Removed the check that reuses MFs connected to a GP and instead just creates a new MF for each line.

[dustine32]

Also added "has input" relations from entity A's MF to B's GP. Example for "MYC has input CDKN2B":

http://68.181.125.171:8910/editor/graph/gomodel:6f188b77-e6bd-4c9a-bdb0-7c4d0f03b4bc

Can also write some SPARQL to simply count MF individuals and compare to # of lines.