replaced attractor repel by a soft-sphere acceleration #53

Job	Run time
build (Release, ON, ON, ON, OFF, OFF)	1m 31s
build (Release, ON, ON, OFF, OFF, OFF)	1m 31s
build (Release, ON, OFF, ON, OFF, OFF)	1m 36s
build (Release, ON, OFF, OFF, OFF, OFF)	1m 22s
build (Release, OFF, ON, ON, OFF, OFF)	4m 26s
build (Release, OFF, ON, OFF, OFF, OFF)	5m 22s
build (Release, OFF, OFF, ON, OFF, OFF)	6m 40s
build (Release, OFF, OFF, OFF, OFF, OFF)	5m 11s
build (Debug, ON, ON, ON, OFF, OFF)	1m 33s
build (Debug, ON, ON, OFF, OFF, OFF)	1m 28s
build (Debug, ON, OFF, ON, OFF, OFF)	1m 2s
build (Debug, ON, OFF, OFF, OFF, OFF)	51s
build (Debug, OFF, ON, ON, OFF, OFF)	5m 25s
build (Debug, OFF, ON, OFF, OFF, OFF)	4m 13s
build (Debug, OFF, OFF, ON, OFF, OFF)	5m 32s
build (Debug, OFF, OFF, OFF, OFF, OFF)	5m 21s
build (Debug, ON, ON, ON, OFF, ON)	1m 22s
build (aswf/ci-vfxall:2021, Release, ON, ON, ON, OFF, OFF)	8m 43s
build (aswf/ci-vfxall:2022, Release, ON, ON, ON, OFF, OFF)	9m 29s
	1h 12m 38s

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