Fixing the phase of the eigenvectors of the Hamiltonian subspace.
Description
Fixing the phase of the eigenvectors of the Hamiltonian subspace. The new treatment should give a consistent result irrespective of the parallelization scheme.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Nicolas Tancogne-Dejean