Improved compatibility to previous Nextflow version #544

Job	Run time
setup	18s
ex001-singularity	14m 7s
ex001-by-step	15m 39s
ex002	8m 29s
ex001 (--viz, true)	10m 21s
ex001 (--start-at illumination --stop-at registration)	1m 47s
ex001 (--background)	10m 28s
ex001 (--background --background-method imagej-rolling-ball)	11m 45s
ex001 (--segmentation cypository --cypository-opts '--channel 10 --scalingFactor 2' --s3seg-opts ...	10m 14s
ex001 (--segmentation ilastik,mesmer)	4m 15s
ex001 (--segmentation cellpose --mcquant-opts '--masks *masks.tif')	6m 32s
	1h 33m 55s

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