Optim ewald long 2 d
Description
Optimizing the calculation of the Ewald summation for 2D systems. On a large system (1900 atoms), the cost of this routines is reduced from 1900s to only 550s.
News snippet
Optimizing the calculation of the Ewald summation for 2D systems.
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