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Added discrete particle method coupling

Christoph Rettinger requested to merge discrete_particle_methods into master

This adds the discrete particle (i.e. subgrid) coupling method to waLBerla. The algorithm is explained in detail in https://arxiv.org/abs/1711.00336 (to be published soon). Two test cases are added that validate the algorithm (settling velocities and bouncing behavior). One showcase is added (bidisperse fluidized bed) to demonstrate the capabilities of the approach.

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