Missing force term from SCF
Description
Implementation of the force term described in Chan et al., Phys. Rev. B 47, 4771 (1993). The convergence of the forces is well accelerated, see attached picture. This is done using the input from the test suite for the forces in periodic systems.Forces.pdf
News snippet
Adding a missing contribution from forces, see Phys. Rev. B 47, 4771 (1993).
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