More explicit message about SMP at startup #1797

Job	Run time
NAMD / test_backends	6m 8s
LAMMPS / test_backends	10m 34s
GROMACS 2022 / test_backends	2m 20s
NAMD3 (no CUDA) / test_backends	5m 36s
GROMACS (MDModules) / test_backends	3m 9s
GROMACS 2023 / test_backends	2m 8s
VMD / test_backends	1m 33s
	31m 28s

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