[TASK]: Matrix configuration cleanup pass

[mwdchang]

Summary

Now that interface/interaction has stabilized somewhat we should perform a round of cleanups to make intentions clearer, and to help build out new features more easily.

Clean up model-configuration index

For model configurations edits, we have this notion of index, which is used to get and to update model-configuration objects. Ideally this should just be the model-configuration ids: Ids are more stable and makes more sense than a seemingly independent and reusable component needing some sense of an index-number from the calling parent. Ids are also a log safer should we go about removing/disabling configurations which would cause all the index numbers to shift around.

Clean up utilities

The domain-specific logic of building the parameter-matrix resides in the pivot.js utility, we should just move it out - as it isn't even a pivot table anymore, much less a generic utility function. Suggestion:

• create a new petri-matrix-service or something like that under model-representation/petri