First changes for `Parameter` class

[ipcamit]

Summary

First major commit toward decoupling Parameters from models

• All of parameter related functions are localized in parameter class
• tests now reflect newer interface

Deleted tests

• The UQ tests were removed as it will take some more time to made adequate changes

TODO

There is certain level of duplication in functionality. Specially between set_opt_param and set_param_mutable. set_param_mutable is supposed to mark the parameters which can mutate during training, while their values can be set in models using set_opt_param.

Originally set_opt_param did both of these tasks so it was fine. This is little confusing now as I guess in current framework more appropriate naming should be set_param_value etc. which would clash with update model params function.

So would try to comeup with more coherent API in future. Hence also holding on modifying UQ stuff till this interface is more mature.

Next up

• dataset class: mainly colabfit integration that Eric provided and capabilities to read multifile xyz
• Property Transformations

[mjwen]

I guess this is not ready for review yet, right? If ready, ping me and I will take a look.

[ipcamit]

Sure. I was holding out for libdescriptor as it would be used in next transformation module of kliff. Now that I have SOAP implemented there, I will write to you and yonathan again for discussing design of new transformation module to contain all possible transforms. Afterwards we can start merging the changes

[ipcamit]

Will raise new pull request with just dataset class