New Integrator and Particle System pushed to next

#1

Hello all,

I’ve just pushed to the next branch the changeset the introduce the new Particle System and Integrator classes. This completely eliminates the previous error-probe buffer-swap mechanism, replaced by associating to each buffer one (or more) “states” of the particle system. Additionally, the sequence of commands to complete a full integration step, as well as the phases they are associated to, are now wrapped into a dedicated Integrator class, which currently has a single concrete specialization, the PredictorCorrector that implements the same flow as usual.

I have verified that the existing problems (plus a few user problems) provide the same results, but as usual with these massive changes, additional validation is always welcome.

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