Optim orthogonalization cg
Description
In some case, makes the orthogonalization used in cg and cg_new eigensolver faster, as it remove the useless copies in memory.
News snippet
Optimization of cg and cg_new in some case.
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.