Bugfix: lanczos and non-hermitian Hamiltonian
Description
Fix a problem for the routines lalg_exp and lalg_phi for non hermitian Hamiltonian.
News snippet
Fix a problem for the routines lalg_exp and lalg_phi for non hermitian Hamiltonian.
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.