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WIP: A mechanism and and input variable to choose automatically the size of the k-points mesh.

Lorenzo Paulatto requested to merge paulatz/q-e:develop into develop

If "0" is specified for nk1, nk2 or nk3 in K_POINTS, the code will compute it using a given distance between k-points, which per default is 0.25 bohr^-1, this corresponds to 4x4x4 in Silicon. The input variable k_density in "system" can be used to tune it.

I'm not 100% sure it is a good idea, or if the default is reasonable.

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