The Rayleigh quotient needs to be normalized for the RMMDIIS, as vectors are not…
Description
The Rayleigh quotient needs to be normalized for the RMMDIIS, as vectors are not orthogonal.
News snippet
Improve the stability of the RMMDIIS solver.
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