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Limit default value of TEST_NP to at most 4 cores
When no default value is provided for TEST_NP, value `nproc / 2 + 1` is used instead, which can be large on hyperthreaded CPUs. This leads to issues in parallel tests that don't scale well with a large number of cores (e.g. when there aren't enough particles) or with a large odd number of cores (e.g. LB or P3M).
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