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Implement correction to S-Pulay force and stress #409

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We were missing a contribution to the force and stress that comes from the Lagrange multiplier used to maintain electron number. This has now been implemented.

We were missing a contribution to the force and stress that
comes from the Lagrange multiplier used to maintain electron
number.  This has now been implemented.
@davidbowler davidbowler added area: main-source Relating to the src/ directory (main Conquest source code) improves: stability Fix or enhance issues with stability or robustness priority: major time: days type: maintenance Refactoring, updating etc labels Mar 21, 2025
@davidbowler davidbowler added this to the Release v1.5 milestone Mar 21, 2025
@davidbowler davidbowler requested a review from tsuyoshi38 March 21, 2025 14:15
@davidbowler davidbowler self-assigned this Mar 21, 2025
@davidbowler
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The failed test is a direct result of the bug fix which has changed the stress! I need to post a replacement reference output.

The bugfix corrects erroneous stress so the reference values need
updating
@davidbowler
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Fixed by adding an updated reference file (with correct stress)

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