fix(physics): kinematics timelines average calculation (#291) #1090

Job	Run time
build_coatjava	3m 26s
download_test_data (detectors, mon)	1m 58s
download_test_data (physics, dst)	3m 33s
build_timelines	46s
test_swifjob (detectors)	1m 22s
run_monitoring (detectors)	3m 9s
test_swifjob (physics)	1m 39s
run_monitoring (physics)	2m 18s
run_timelines (physics)	44s
run_timelines (detectors, -n 4 --skip-mya)	3m 47s
Deployment	29s
	23m 11s

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