replace oboInOwl:is_inferred=true for axioms that are inferred by reasoning

[cmungall]

We want to be able to record provenance on axioms in general. A specific case of this is recording that an axiom was generated by a reasoning process:

robot will optionally tag inferred axioms with oio:is_inferred="true":

http://robot.obolibrary.org/reason

https://github.com/ontodev/robot/blob/9cc988a56a56f23deb8df604403cfaa3484b0f53/robot-core/src/main/java/org/obolibrary/robot/ReasonOperation.java#L448-L453

I am responsible for this choice, but am happy with whatever the community decides. (if we chose a new AP we would likely make a new robot option to preserve backwards compatibility)

We can do this at different granularity:

• boolean yes/no indicator
• name of reasoner e.g. Elk
• other metadata e.g. date at which reasoning was performed, hashes of input ontologies
• a full prov graph

Related:

• ontodev/robot#893
• ontodev/robot#6