Model and data objects missing in PM_result after rust run

[mnneely]

They aren't being saved, so they aren't being loaded. This will cause all kinds of functions which need to access the data and model in the PM_result to crash. Need to save the PM_data and PM_model$model_list objects after a run.

[mhovd]

I made some slight changes to this, allowing the user (or us) to give the PM_fit directly
If you have the time, can you give it a look?

LAPKB/Pmetrics@3151770

[mnneely]

Looks fine to me. You saw that I added a cov object to make rust output compatible with the PM_cov functions, but I see you made it a conditional creation. I’m on vacation at the moment with only my iPad, so I don’t have my laptop to look properly at code, but it looks like this is a good error check, since make_Cov depends on final existing.