AmiGO should explain its basis for inference

[cmungall]

It's fantastic that we see annotations propagate over occurs_in:
http://amigo.geneontology.org/amigo/term/CL:0011004

But we should explain this: not full blown Protege explanations (though perhaps at some later time); just exposing the configuration

I know we have this:
http://amigo.geneontology.org/amigo/schema_details

But this isn't quite right.

We should have some kind of link on any data table (associations, terms) that says "why are these results here". On mousing/clicking the explanation would be "on this page, we traverse over R1, R2 and R3, click here [link to generic inference docs]". The text for this could be hardcoded but it would be nice to introspect. Not completely trivial, as this is probably some mixture of what is in the yaml and some logic embedded in the java of the golr loader.

Should probably be done after #201