WIP: Add xgc runs given to me by Jong Choi.

This is a very large (327 MB) addition of XGC test data. @caitlin.ross : Could you clone and tell me if it's annoying to have this much in the repo? Does kitware have limits on it's lfs server?

(Note: I still need to check that this data is actually relevant to us, but if it's too large, then it's certainly not!)