cubicweb-medicalexp #3514963 Backport secondary views [validation pending]

Backport outofcontext views to Brainomics cube.

prioritynormal
typebug
done in0.9.0
load0.200
load left0.000
closed by#d481da345796 [views] Remove secondary.py file and backport outofcontext views to Brainomics cube, closes #3514963
patch[views] Remove secondary.py file and backport outofcontext views to Brainomics cube, closes #3514963 [applied]