New GSO-GSRM module with mindat ids

[skybristol]

One of my projects in USGS is building a knowledgebase focused toward our broad geoscience portfolio. We're building this in a Wikibase because of the many tools that our folks can use to contribute through time, but also because of the adjacency with Wikidata and a desire to see more of our knowledge represented in the "Global Knowledge Commons."

We initially took a crack at incorporating basic pointers to many Mindat entities that we also need, but as we've moved things along, some of our geologists have expressed some frustration with liberties taken and insufficient traceability to original scientific reference sources. The Geoscience Ontology seems like it is going to be a much better amalgamation for us to work from, and so I'm going through your modeling to see how best to do that. I do want to retain our linkages to Mindat as you have done for minerals in the GSMIN module.

This pull request is for some addition to the GSMR module with gsmin:mindatid and gsmin:mindaturl values that come from work we already did on pulling the Mindat rock classification. I'll be unwinding that in our graph in favor of the GSMR classes, but I thought I'd push the identifier linkages back in case you want to incorporate them here. The python code where I did this is in a branch here.

I'll have other work going on once we work through a few more aspects of the GSO to translate what we want to work with into the Wikibase framework, which is fundamentally a triple store but with some nuance.