cubicweb-brainomics #3280244 Cleanup of the code [deprecated]

Cleaning up the code, especially the views;

Add docstring + some tests if necessary;

Reorganize a bit the different views (e.g. moving the "detailled assessments" of a subject in a separated tab);

Create a generic PrimaryView for AnyEntity following the design of Brainomics UI, in order to have an homogenous design even for less important Etype.

done in0.9.0
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