Update documentation for mass-weighted force (relating to IRL2/nanover-server-py#550)#197

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fix/mass-weighted-force

Commits on Mar 17, 2026

Add documentation to reflect the changes in the mass-weighted force generally applied to the COM of a group of atoms, and the associated energy
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Commits on Mar 23, 2026

Add section to documentation to specify what happens in the case of particles with zero mass
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