Submesh ISF
Description
Adding the possibility to use the ISF Poisson solver to compute the Coulomb integrals for the DFT+U. This is not the default as it is only working for cubic cells and without domain parallelization at the moment. This makes the calculation of the Coulomb matrix elements much faster than using the direct sum.
News snippet
Adding the possibility to use the ISF Poisson solver to compute the Coulomb integrals for the DFT+U.
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.