Adding components to the Solution

[GarzonDiegoFEUP]

I have being exploring the Solution class, and I found these possible issues:

1. When doing an EntryPoint for a solution, if you try to modify the solutes, an error will appear and the entry will not work anymore. I know the proper way will be to add a component, but the solvent list should not be editable.
2. The solute and the solvent should be add at the same time (without saving in between), because then the molar concentration cannot be calculated. So maybe there should be a safe check to only calculate the molar concentration when both solvent and solute are not empty.
3. In the ThinFilmStack class you add Substrate and layers, instead of components so it works the other way around as solutions, which I don't think should be the case.

Thank you @aalbino2 @ka-sarthak !!

[ka-sarthak]

Hi @GarzonDiegoFEUP, your feedback on the solution classes is much appreciated.

1. You are right that solute and solvent should be non-editable to avoid confusion. We don't have an annotation to make sub-sections non-editable. But here's an issue you can follow regarding it: https://gitlab.mpcdf.mpg.de/nomad-lab/nomad-FAIR/-/issues/2151
2. The molar concentration should be calculated if the volume is available. If you add just a solute and save it, the molar concentration should not work because the volume is missing. In fact as I test it now, I get a warning saying "Volume of the solution is missing, can not calculate the concentration of the component ClNa." as expected, but I also get an unexpected error from self.combine_components(self.solutes, logger). I will take a look into this. Add solutions category and resolve bug in combine_components #106

[ka-sarthak]

2. The issue was in the MSection.m_copy() method in nomad-lab. Here's an MR to fix it: https://gitlab.mpcdf.mpg.de/nomad-lab/nomad-FAIR/-/merge_requests/2127. Once we update the nomad version in the oasis, this should be fixed.