Christian Svensson 74dce59c7d lbm-gpu: sum the Zou-He deviations before adding the weights ...

The open boundaries summed the tangential and outgoing populations as
deviations from their weights plus the weights (2/3 and 1/6), in single
precision; at low speed the weights round away the deviations' last
digits. A low-speed case through an inlet, an outlet and a slip face
came out 2.26e-5 of the largest speed from the CPU under DXC, against
the 2e-5 the tests allow. The deviations are now summed first and the
total weight, exactly 1, added once: the same Zou-He rule, so results
change only at the round-off level.

Part of #562.

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src

lbm-gpu: sum the Zou-He deviations before adding the weights

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tests

lbm-gpu: the temperature lattice on the GPU

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Cargo.toml

lbm-gpu: the temperature lattice on the GPU

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