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Description
This PR proposes a method of getting the reaction pathways from a openmc.chain object. We have a few other get methods in the chain class so I wonder if more methods are welcome or if this is unessecary bloat. Naturally I find it useful to be able to find the reaction pathways to a specific target nuclide.
For example here is the user code that gets the reaction pathways for making stable Gold which surely everyone would want to know.
example usage
In addition to the chain reactions this method also accounts for secondaries so that the pathways for producing helium or hydrogen isotopes can also be found like this
tritium_pathways=pathways['H3']
I've added some simple tests that check the types and contents on the returned dictionary
Fixes # (issue)
Checklist