remove old in_taxon triples when saving

[balhoff]

Minerva calculates related taxa, based on gene products, each time it saves a model. It seems like these persist even if those genes are removed from the model. Minerva should clear old taxon assignments before calculating.

See geneontology/go-annotation#4248

[balhoff]

@kltm I have a fix in #504, which has also been merged to the dev branch for testing. With these changes this issue is self-correcting if a problem model is opened and saved.

[kltm]

@balhoff @vanaukenk The choices are as follows then:

• allow people to know about the problem, open suspect models, make a change (I assume this is a prerequisite), and then save
• since the list is not that long, a group of us do this for users
• we remove the bad model-level annotations through some other TBD bulk process at the next outage

[kltm]

@balhoff @vanaukenk I'll put this up on noctua-dev ASAP.

[kltm]

Experimenting a little w/@balhoff, it looks like the person who saves gets credit. I think that that might make number "2" above a little unpalatable.

[kltm]

@vanaukenk Just checking in on this. Are we satisfied enough to have this go in during the next outage and do we want to do more than let users naturally solve this problem over time? (I'm think there might have been another ticket or gist for this too...)