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Molecular dynamics by NMR data analysis

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Spun out the centre_of_mass() function to its own module.

This new module will contain all functions related to mass and inertia.

Authored by: bugman 2008-04-07

Parent: [r5347]

changed	/1.3/generic_fns/structure/structure.py
copied	/1.3/generic_fns/structure/structure.py -> /1.3/generic_fns/structure/mass.py

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