Nicolas Tancogne-Dejean requested to merge simplify_code_logic into develop May 28, 2021

Description

Simplify the logic of the subspace. This is needed for a future change which will combine orthogonalization and subspace diagonalization.

News snippet

Code refactoring.

Checklist

I have checked that my code follows the Octopus coding standards
I have added tests for all the new features added in this request.